Optimize png files in ui/webui win8

$./tools/resources/optimize-png-files.sh -o2 -r10000 ui/webui/ win8
Processed 62 files (out of 69 files) in 00:24:44s
Result : 85472 => 68772 bytes (16700 bytes : 19 %)

BUG=313729
TBR=xiyuan@chromium.org,cpu@chromium.org

Review URL: https://codereview.chromium.org/57563008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@232872 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 232872
Disable flaky test: ProfileManagerBrowserTest.EphemeralProfile

This is a re-commit of https://codereview.chromium.org/58183006 with a syntax
error fixed.

BUG=314905
R=pastarmovj@chromium.org
TBR=pastarmovj@chromium.org

Review URL: https://codereview.chromium.org/46893006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@232873 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 232873