Revert strict containment check in checkInferType
Revert strict containment check in checkInferType

kpreisser/TypeScript,minestarks/TypeScript,Microsoft/TypeScript,donaldpipowitch/TypeScript,nojvek/TypeScript,weswigham/TypeScript,basarat/TypeScript,Microsoft/TypeScript,microsoft/TypeScript,minestarks/TypeScript,kpreisser/TypeScript,kitsonk/TypeScript,weswigham/TypeScript,SaschaNaz/TypeScript,RyanCavanaugh/TypeScript,basarat/TypeScript,RyanCavanaugh/TypeScript,donaldpipowitch/TypeScript,Microsoft/TypeScript,basarat/TypeScript,kitsonk/TypeScript,SaschaNaz/TypeScript,microsoft/TypeScript,nojvek/TypeScript,donaldpipowitch/TypeScript,SaschaNaz/TypeScript,microsoft/TypeScript,weswigham/TypeScript,alexeagle/TypeScript,minestarks/TypeScript,donaldpipowitch/TypeScript,nojvek/TypeScript,basarat/TypeScript,alexeagle/TypeScript,kitsonk/TypeScript,RyanCavanaugh/TypeScript,nojvek/TypeScript,SaschaNaz/TypeScript,kpreisser/TypeScript,alexeagle/TypeScript