Remove unused properties

These two projects don't use GWT, so they don't need GWT-Version
specified.

Change-Id: Ib013ab90be4e5a9746344cf81d1e1edf8e416c5c

example-webLinkPatchSet/pom.xml

diff --git a/example-webLinkPatchSet/pom.xml b/example-webLinkPatchSet/pom.xml
index 5bde97a..c311e69 100644
--- a/example-webLinkPatchSet/pom.xml
+++ b/example-webLinkPatchSet/pom.xml
@@ -30,7 +30,6 @@
   <properties>
     <Gerrit-ApiType>plugin</Gerrit-ApiType>
     <Gerrit-ApiVersion>${project.version}</Gerrit-ApiVersion>
-    <GWT-Version>2.8.2</GWT-Version>
   </properties>
 
   <build>

example-webLinkProject/pom.xml

diff --git a/example-webLinkProject/pom.xml b/example-webLinkProject/pom.xml
index 83694b5..de4de37 100644
--- a/example-webLinkProject/pom.xml
+++ b/example-webLinkProject/pom.xml
@@ -30,7 +30,6 @@
   <properties>
     <Gerrit-ApiType>plugin</Gerrit-ApiType>
     <Gerrit-ApiVersion>${project.version}</Gerrit-ApiVersion>
-    <GWT-Version>2.8.2</GWT-Version>
   </properties>
 
   <build>