Add angular.Attributes.$addClass and .$removeClass to 1.3 externs.
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Created by MOE: http://code.google.com/p/moe-java
MOE_MIGRATED_REVID=71696431
Yield-for support inside generator functions.
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Created by MOE: http://code.google.com/p/moe-java
MOE_MIGRATED_REVID=71700959