GitLab

It's possible client returns buffer after cached_dibs_ are freed.
Also fix a copy&paste error.

BUG=133096
TEST=the pages in bug 133096 do not crash.
Review URL: https://chromiumcodereview.appspot.com/10748018

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@146044 0039d316-1c4b-4281-b951-d872f2087c98