Remove references to Log4J

Log4J API dependency is automatically implied by the Gerrit API
and does not need to specified in the pom.xml.

Bug: Issue 16620
Change-Id: Icafb82e34015609e5583f35f706afcd9270a891b

github-oauth/pom.xml

diff --git a/github-oauth/pom.xml b/github-oauth/pom.xml
index b2abf59..c39d1e0 100644
--- a/github-oauth/pom.xml
+++ b/github-oauth/pom.xml
@@ -87,24 +87,6 @@
       <scope>provided</scope>
     </dependency>
     <dependency>
-      <groupId>org.slf4j</groupId>
-      <artifactId>slf4j-api</artifactId>
-      <version>1.7.5</version>
-      <scope>provided</scope>
-    </dependency>
-    <dependency>
-      <groupId>org.slf4j</groupId>
-      <artifactId>slf4j-log4j12</artifactId>
-      <version>1.7.5</version>
-      <scope>provided</scope>
-    </dependency>
-    <dependency>
-      <groupId>log4j</groupId>
-      <artifactId>log4j</artifactId>
-      <version>1.2.17</version>
-      <scope>provided</scope>
-    </dependency>
-    <dependency>
       <groupId>org.kohsuke</groupId>
       <artifactId>github-api</artifactId>
       <version>1.116</version>