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yzshen@chromium.org authored
So that we can avoid creating PassThroughFilter. The CL also makes FilterChain::GetHead() a little more efficient (SyncDispatcher calls it once for receiving each message). BUG=None TEST=None R=darin@chromium.org Review URL: https://codereview.chromium.org/291583005 git-svn-id: svn://svn.chromium.org/chrome/trunk/src@271107 0039d316-1c4b-4281-b951-d872f2087c98
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