[NEW TYPE INFERENCE] Rename method in FunctionType to have the same name as the DeclFunType method.
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Created by MOE: http://code.google.com/p/moe-java
MOE_MIGRATED_REVID=79271972
[NEW TYPE INFERENCE] Cleanups to assert handling
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Created by MOE: http://code.google.com/p/moe-java
MOE_MIGRATED_REVID=79277516