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The implementation of buffered data source that uses buffered resource loader
to download a media object and does buffering. This implementation knows
when to do defer loading and when to restarts the loading. The implementation
uses one buffered resource loading for one data source and does no connection
recovery.

Review URL: http://codereview.chromium.org/88047

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@14818 0039d316-1c4b-4281-b951-d872f2087c98