GitLab

Makes WaitingCallback cancel a wait if there is a wait pending and
it's deleted.
Makes MessagePumpMojo deal with MOJO_RESULT_CANCELLED.

BUG=371755
TEST=see bug
R=darin@chromium.org, mpcomplete@chromium.org

Review URL: https://codereview.chromium.org/276093002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@269663 0039d316-1c4b-4281-b951-d872f2087c98