[gwt-contrib] Fix a bug where GWT-RPC would not generate some covariant array types, possibly causing inconsis... (issue1869804)

[skybrian]

Reviewers: cromwellian,

Description:
Fix a bug where GWT-RPC would not generate some covariant array types,
possibly causing inconsistent serialization policies. Includes a test.
Fixes issue 7791


Please review this at http://gwt-code-reviews.appspot.com/1869804/

Affected files:
  M  
user/src/com/google/gwt/user/rebind/rpc/SerializableTypeOracleBuilder.java
  M  
user/test/com/google/gwt/user/rebind/rpc/SerializableTypeOracleBuilderTest.java
  A  
user/test/com/google/gwt/user/rebind/rpc/testcases/client/SubclassUsedInArray.java


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