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

git-svn-id: e8541e15acce502a64c929015570ad1648e548cd@6709 2bbb7eff-a529-9590-31e7-b0007b416f81

Cue/skia,Cue/skia,Cue/skia,Cue/skia