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This is the reimplementation of https://codereview.chromium.org/11416091/, without the merge problems that was introduced in one of the latest Patch Lists.


BUG=

Review URL: https://chromiumcodereview.appspot.com/11316206

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@169841 0039d316-1c4b-4281-b951-d872f2087c98