Speculative Crash fix: Return early if user cancels save dialog.
Speculative Crash fix: Return early if user cancels save dialog.

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: http://src.chromium.org/svn/trunk/src@20132 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: ed65f600892c1a4d8fb24407e9434926f894f861
meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser