Fix GrabWindowSnapshot for Mac Chrome. Changed the mechanism to take a screenshot over to CG; we now just take a direct bit dump of the window into an image and convert that to a png.
Fix GrabWindowSnapshot for Mac Chrome.
Changed the mechanism to take a screenshot over to CG; we now just take a direct bit dump of the window into an image and convert that to a png.

BUG=69160
TEST=Tested with sending feedback from a Mac; screenshot appeared on screen and on the report correctly.

Review URL: http://codereview.chromium.org/6121005

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@71233 0039d316-1c4b-4281-b951-d872f2087c98

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