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This is almost the same patch [1] as was reverted last week due to flakiness in one of the Win tests, but for one change: MediaStreamManager is not called from MediaStreamDispatcherHost::OnChannelClosing, to avoid shut-down crash. This will be changed as soon as the shut-down issue is solved.

[1] http://codereview.chromium.org/7649016/

Review URL: http://codereview.chromium.org/7948004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@102255 0039d316-1c4b-4281-b951-d872f2087c98