http: clear out clirr-ignored-differences

https://codereview.appspot.com/12545045/

Author: Yaniv Inbar

clirr-ignored-differences.xml

@@ -1,17 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!-- see http://mojo.codehaus.org/clirr-maven-plugin/examples/ignored-differences.html -->
 <differences>
-  <!-- 7002 (method removed): className, method -->
-  <difference>
-    <differenceType>7002</differenceType>
-    <className>com/google/api/client/http/protobuf/ProtoHttpContent</className>
-    <method>com.google.api.client.http.protobuf.ProtoHttpContent setType(java.lang.String)</method>
-  </difference>
   <!-- 8001 (Class removed): className -->
-  <difference>
-    <differenceType>8001</differenceType>
-    <className>com/google/api/client/testing/http/json/*</className>
-  </difference>
   <difference>
     <differenceType>8001</differenceType>
     <className>com/google/api/client/repackaged/**</className>