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ProcessUpdatesCommand was the only child of ModelChangingSyncerCommand
to override this function.  Since it is special, let's just treat it
specially in syncer.cc rather than modifying ModelChangingSyncerCommand
to suit its needs.

BUG=36594
TEST=


Review URL: http://codereview.chromium.org/8510079

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@110555 0039d316-1c4b-4281-b951-d872f2087c98