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This implements an extensions API to abort a stream that has been started. Aborting the stream will cause the original URL request to be cancelled, which may be desired if the client of the API wants to cancel the request before it is completely downloaded.

BUG=348464,303491
R=jam@chromium.org, kalman@chromium.org, mpearson@chromium.org, zork@chromium.org

Review URL: https://codereview.chromium.org/281513003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@273087 0039d316-1c4b-4281-b951-d872f2087c98