Omit "int" when using "unsigned" modifier 

Omitting "int" when using "unsigned" modifier as per Blink Coding Style Guidelines.

BUG=NONE

Review URL: https://codereview.chromium.org/207783002

git-svn-id: svn://svn.chromium.org/blink/trunk@170023 bbb929c8-8fbe-4397-9dbb-9b2b20218538