Fix RPC charset parameter tests to be consistent with ServletResponse#getCharacterEncoding(),
i.e. return only the charset (e.g. 'UTF-8') and do not include the Content-Type charset parameter (e.g. 'charset=UTF-8')
See http://tomcat.apache.org/tomcat-5.5-doc/servletapi/javax/servlet/ServletResponse.html#getCharacterEncoding()

Review at http://gwt-code-reviews.appspot.com/723803

Review by: amitmanjhi@google.com

git-svn-id: https://google-web-toolkit.googlecode.com/svn/trunk@8490 8db76d5a-ed1c-0410-87a9-c151d255dfc7
diff --git a/user/test/com/google/gwt/user/server/rpc/RPCServletUtilsTest.java b/user/test/com/google/gwt/user/server/rpc/RPCServletUtilsTest.java
index e5cd514..d6b90b6 100644
--- a/user/test/com/google/gwt/user/server/rpc/RPCServletUtilsTest.java
+++ b/user/test/com/google/gwt/user/server/rpc/RPCServletUtilsTest.java
@@ -53,7 +53,7 @@
 
     @Override
     public String getCharacterEncoding() {
-      return "charset=utf-8";
+      return "utf-8";
     }
 
     @Override
@@ -174,7 +174,7 @@
 
       @Override
       public String getCharacterEncoding() {
-        return "charset=EBCDIC-US";
+        return "EBCDIC-US";
       }
     };
 
@@ -197,7 +197,7 @@
 
       @Override
       public String getCharacterEncoding() {
-        return "charset=EBCDIC-US";
+        return "EBCDIC-US";
       }
     };
     boolean gotException = false;