Destroy pending tasks marshaled through windows messages avoiding possible crashes when object is destroyed and there is tasks in the queue. BUG=none TEST=none
Destroy pending tasks marshaled through windows messages avoiding possible crashes when object is destroyed and there is tasks in the queue.
BUG=none
TEST=none

Review URL: http://codereview.chromium.org/661145

git-svn-id: http://src.chromium.org/svn/trunk/src@40125 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 2d471f8394fb53fedc50912e0edda5c8ad862c8c
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