Chrome Externs: Add inlineInstallPrivate API.
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Created by MOE: http://code.google.com/p/moe-java
MOE_MIGRATED_REVID=81462459
[NEW TYPE INFERENCE] Check validity for all FunctionTypes

Also, make Function loose by default and avoid creating unnecessary loose types.
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Created by MOE: http://code.google.com/p/moe-java
MOE_MIGRATED_REVID=81476159