Put the early code-removal passes under options.extraSmartNameRemoval.
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Created by MOE: http://code.google.com/p/moe-java
MOE_MIGRATED_REVID=64147819
Implement nextTick in terms of Promise where availale.
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Created by MOE: http://code.google.com/p/moe-java
MOE_MIGRATED_REVID=64164043