GitLab

BUG=138550
Test=Manual
Run ChromeOS with --force-device-scale-factor=2
Go to a website for the first time. Favicon appears in HiDPI in tab strip on CrOS.

Review URL: https://chromiumcodereview.appspot.com/10824296

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@151942 0039d316-1c4b-4281-b951-d872f2087c98