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GdkGC is deprecated and will be removed in gtk3 and cairo should be faster anyway. This uses the new CairoCachedSurface in gfx::Image.

BUG=79722
TEST=none


Review URL: http://codereview.chromium.org/8781001

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@112839 0039d316-1c4b-4281-b951-d872f2087c98