Rebaseline LayoutTests failing due to libpng update.

BUG=303648

Review URL: https://codereview.chromium.org/26520005

git-svn-id: svn://svn.chromium.org/blink/trunk@160117 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Auto-rebaseline for r160061

http://src.chromium.org/viewvc/blink?view=revision&revision=160061

BUG=306882
TBR=tkent@chromium.org

Review URL: https://codereview.chromium.org/33793005

git-svn-id: svn://svn.chromium.org/blink/trunk@160118 bbb929c8-8fbe-4397-9dbb-9b2b20218538