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If a channel closes right before a send call, listeners might not be notified of
the problem, which can cause hangs. This CL fixes that and adds a test that makes
sure that this does not happen in the future.

This is cl/30133002 + a memory leak fix.

BUG=338709

Review URL: https://codereview.chromium.org/150893002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@250964 0039d316-1c4b-4281-b951-d872f2087c98