GitLab

I'm not able to repro the crash, but this seems safer overall.

BUG=16081
TEST=Right click an image, Save as, Chrome should not crash.

Review URL: http://codereview.chromium.org/149244

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@20132 0039d316-1c4b-4281-b951-d872f2087c98