Remove some unused variables reported by pyflakes
Remove some unused variables reported by pyflakes

BUG=none
TEST=trybots

Review URL: https://chromiumcodereview.appspot.com/10383017
old8xp/gyp_from_google,old8xp/gyp_from_google,old8xp/gyp_from_google,old8xp/gyp_from_google,old8xp/gyp_from_google