Rebaseline LayoutTests failing due to libpng update.
Rebaseline LayoutTests failing due to libpng update.

BUG=303648

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

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@160117 bbb929c8-8fbe-4397-9dbb-9b2b20218538

axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk