utils.gyp: add SkCityHash.h, delete SkConsistentChecksum.h Review URL: https://codereview.appspot.com/6906050
utils.gyp: add SkCityHash.h, delete SkConsistentChecksum.h
Review URL: https://codereview.appspot.com/6906050

csulmone/skia,csulmone/skia,csulmone/skia,csulmone/skia