HttpPluginServlet: Remove usage of deprecated IMPLEMENTATION_URL constant

IMPLEMENTATION_URL is deprecated in Java 8 [1].

[1] https://docs.oracle.com/javase/8/docs/api/java/util/jar/Attributes.Name.html#IMPLEMENTATION_URL

Change-Id: Iab607c70d4f7760dc27cc13ffcac390602a4035a
diff --git a/Documentation/dev-plugins.txt b/Documentation/dev-plugins.txt
index 8315776..dbaa3c1 100644
--- a/Documentation/dev-plugins.txt
+++ b/Documentation/dev-plugins.txt
@@ -94,7 +94,6 @@
   Implementation-Title: Example plugin showing examples
   Implementation-Version: 1.0
   Implementation-Vendor: Example, Inc.
-  Implementation-URL: http://example.com/opensource/plugin-foo/
 ====
 
 === ApiType
diff --git a/gerrit-httpd/src/main/java/com/google/gerrit/httpd/plugins/HttpPluginServlet.java b/gerrit-httpd/src/main/java/com/google/gerrit/httpd/plugins/HttpPluginServlet.java
index beb0139..2190fe0 100644
--- a/gerrit-httpd/src/main/java/com/google/gerrit/httpd/plugins/HttpPluginServlet.java
+++ b/gerrit-httpd/src/main/java/com/google/gerrit/httpd/plugins/HttpPluginServlet.java
@@ -488,7 +488,6 @@
       String t = main.getValue(Attributes.Name.IMPLEMENTATION_TITLE);
       String n = main.getValue(Attributes.Name.IMPLEMENTATION_VENDOR);
       String v = main.getValue(Attributes.Name.IMPLEMENTATION_VERSION);
-      String u = main.getValue(Attributes.Name.IMPLEMENTATION_URL);
       String a = main.getValue("Gerrit-ApiVersion");
 
       html.append("<table class=\"plugin_info\">");
@@ -507,11 +506,6 @@
             .append(v)
             .append("</td></tr>\n");
       }
-      if (!Strings.isNullOrEmpty(u)) {
-        html.append("<tr><th>URL</th><td>")
-            .append(String.format("<a href=\"%s\">%s</a>", u, u))
-            .append("</td></tr>\n");
-      }
       if (!Strings.isNullOrEmpty(a)) {
         html.append("<tr><th>API Version</th><td>")
             .append(a)
diff --git a/gerrit-plugin-archetype/src/main/resources/META-INF/maven/archetype-metadata.xml b/gerrit-plugin-archetype/src/main/resources/META-INF/maven/archetype-metadata.xml
index 270e15c..e32a0d6 100644
--- a/gerrit-plugin-archetype/src/main/resources/META-INF/maven/archetype-metadata.xml
+++ b/gerrit-plugin-archetype/src/main/resources/META-INF/maven/archetype-metadata.xml
@@ -31,9 +31,6 @@
     <requiredProperty key="Implementation-Vendor">
       <defaultValue>Gerrit Code Review</defaultValue>
     </requiredProperty>
-    <requiredProperty key="Implementation-Url">
-      <defaultValue>https://www.gerritcodereview.com/</defaultValue>
-    </requiredProperty>
 
     <requiredProperty key="gerritApiType">
       <defaultValue>plugin</defaultValue>
diff --git a/gerrit-plugin-archetype/src/main/resources/archetype-resources/pom.xml b/gerrit-plugin-archetype/src/main/resources/archetype-resources/pom.xml
index a6103b1..026e21d 100644
--- a/gerrit-plugin-archetype/src/main/resources/archetype-resources/pom.xml
+++ b/gerrit-plugin-archetype/src/main/resources/archetype-resources/pom.xml
@@ -50,7 +50,6 @@
 #end
 
               <Implementation-Vendor>${Implementation-Vendor}</Implementation-Vendor>
-              <Implementation-URL>${Implementation-Url}</Implementation-URL>
 
               <Implementation-Title>${Gerrit-ApiType} ${project.artifactId}</Implementation-Title>
               <Implementation-Version>${project.version}</Implementation-Version>
diff --git a/gerrit-plugin-gwt-archetype/src/main/resources/META-INF/maven/archetype-metadata.xml b/gerrit-plugin-gwt-archetype/src/main/resources/META-INF/maven/archetype-metadata.xml
index 3c3508c..32a603b 100644
--- a/gerrit-plugin-gwt-archetype/src/main/resources/META-INF/maven/archetype-metadata.xml
+++ b/gerrit-plugin-gwt-archetype/src/main/resources/META-INF/maven/archetype-metadata.xml
@@ -21,9 +21,6 @@
     <requiredProperty key="Implementation-Vendor">
       <defaultValue>Gerrit Code Review</defaultValue>
     </requiredProperty>
-    <requiredProperty key="Implementation-Url">
-      <defaultValue>https://www.gerritcodereview.com/</defaultValue>
-    </requiredProperty>
     <requiredProperty key="Gwt-Version">
       <defaultValue>2.7.0</defaultValue>
     </requiredProperty>
diff --git a/gerrit-plugin-gwt-archetype/src/main/resources/archetype-resources/pom.xml b/gerrit-plugin-gwt-archetype/src/main/resources/archetype-resources/pom.xml
index d67c7cb..2c7fe88 100644
--- a/gerrit-plugin-gwt-archetype/src/main/resources/archetype-resources/pom.xml
+++ b/gerrit-plugin-gwt-archetype/src/main/resources/archetype-resources/pom.xml
@@ -45,7 +45,6 @@
               <Gerrit-Module>${package}.Module</Gerrit-Module>
               <Gerrit-HttpModule>${package}.HttpModule</Gerrit-HttpModule>
               <Implementation-Vendor>${Implementation-Vendor}</Implementation-Vendor>
-              <Implementation-URL>${Implementation-Url}</Implementation-URL>
 
               <Implementation-Title>${Gerrit-ApiType} ${project.artifactId}</Implementation-Title>
               <Implementation-Version>${project.version}</Implementation-Version>
diff --git a/gerrit-plugin-js-archetype/src/main/resources/META-INF/maven/archetype-metadata.xml b/gerrit-plugin-js-archetype/src/main/resources/META-INF/maven/archetype-metadata.xml
index fbf1e46..ef0e96c 100644
--- a/gerrit-plugin-js-archetype/src/main/resources/META-INF/maven/archetype-metadata.xml
+++ b/gerrit-plugin-js-archetype/src/main/resources/META-INF/maven/archetype-metadata.xml
@@ -21,9 +21,6 @@
     <requiredProperty key="Implementation-Vendor">
       <defaultValue>Gerrit Code Review</defaultValue>
     </requiredProperty>
-    <requiredProperty key="Implementation-Url">
-      <defaultValue>https://gerrit.googlesource.com/</defaultValue>
-    </requiredProperty>
 
     <requiredProperty key="gerritApiType">
       <defaultValue>js</defaultValue>
diff --git a/gerrit-plugin-js-archetype/src/main/resources/archetype-resources/pom.xml b/gerrit-plugin-js-archetype/src/main/resources/archetype-resources/pom.xml
index f24d81e..8f4aadd 100644
--- a/gerrit-plugin-js-archetype/src/main/resources/archetype-resources/pom.xml
+++ b/gerrit-plugin-js-archetype/src/main/resources/archetype-resources/pom.xml
@@ -44,7 +44,6 @@
             <manifestEntries>
               <Gerrit-PluginName>${pluginName}</Gerrit-PluginName>
               <Implementation-Vendor>${Implementation-Vendor}</Implementation-Vendor>
-              <Implementation-URL>${Implementation-Url}</Implementation-URL>
 
               <Implementation-Title>${Gerrit-ApiType} ${project.artifactId}</Implementation-Title>
               <Implementation-Version>${project.version}</Implementation-Version>