Some small cleanup to Graphs. ------------- Created by MOE: https://github.com/google/moe MOE_MIGRATED_REVID=114030721
Some small cleanup to Graphs.
-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=114030721

typetools/guava,jakubmalek/guava,mosoft521/guava,google/guava,Xaerxess/guava,tli2/guava,google/guava,jakubmalek/guava,berndhopp/guava,mosoft521/guava,Xaerxess/guava,tli2/guava,EdwardLee03/guava,EdwardLee03/guava,xasx/guava,berndhopp/guava,DavesMan/guava,DavesMan/guava,rgoldberg/guava,rgoldberg/guava,typetools/guava,google/guava,xasx/guava,mosoft521/guava