Switch ParserTest to explicitly use the old parser, even after the new one is turned on.
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Created by MOE: http://code.google.com/p/moe-java
MOE_MIGRATED_REVID=63271892
Fix a couple ErrorProne warnings.
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Created by MOE: http://code.google.com/p/moe-java
MOE_MIGRATED_REVID=63272317