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Additionally, downloaded profile image is no more saved to file every time it is downloaded after login.

BUG=chromium-os:23684
TEST=Manual: see bug description

Review URL: http://codereview.chromium.org/8822015

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@113592 0039d316-1c4b-4281-b951-d872f2087c98