[gwt-contrib] Allow RPC for unmodificable collections (issue620805)

[rice]

Reviewers: jat,

Description:
Allow RPC for unmodificable collections

Please review this at http://gwt-code-reviews.appspot.com/620805/show

Affected files:
  M user/src/com/google/gwt/user/client/rpc/core/java/util/Collections.java
  M  
user/src/com/google/gwt/user/client/rpc/core/java/util/TreeSet_CustomFieldSerializer.java
  M user/super/com/google/gwt/emul/java/util/Collections.java
  M user/test/com/google/gwt/emultest/java/util/CollectionsTest.java
  M user/test/com/google/gwt/user/client/rpc/CollectionsTest.java
  M user/test/com/google/gwt/user/client/rpc/CollectionsTestService.java
  M  
user/test/com/google/gwt/user/client/rpc/CollectionsTestServiceAsync.java
  M user/test/com/google/gwt/user/client/rpc/TestSetFactory.java
  M user/test/com/google/gwt/user/client/rpc/TestSetValidator.java
  M user/test/com/google/gwt/user/server/rpc/CollectionsTestServiceImpl.java


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