Revert 54584 - Delete tasks unconditionally in MessageLoop::DeletePendingTasks().
Revert 54584 - Delete tasks unconditionally in MessageLoop::DeletePendingTasks().

BUG=6532
TEST=existing unit tests

Review URL: http://codereview.chromium.org/3076015

TBR=akalin@chromium.org
Review URL: http://codereview.chromium.org/2878074

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@54697 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser