Fixed Skia compilation error with strict clang.

BUG=skia:
R=reed@google.com, sergeyberezin@chromium.org, hcm@google.com

Author: kolczyk@opera.com

Review URL: https://codereview.chromium.org/227043006

git-svn-id: http://skia.googlecode.com/svn/trunk@14071 2bbb7eff-a529-9590-31e7-b0007b416f81
2 files changed