Gracefully do nothing when run loop sources fire and no delegate is available. This can happen if foreign code spins the run loop without Run being on the stack.
Gracefully do nothing when run loop sources fire and no delegate is available.
This can happen if foreign code spins the run loop without Run being on the
stack.

BUG=2708
TEST=none
Review URL: http://codereview.chromium.org/149082

git-svn-id: http://src.chromium.org/svn/trunk/src@19382 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 986c225c8d76c158a6b66ede83886a13df97a0c3
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