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This is a "dumbed down" implementation with several open TODOs.  Future
CLs will add auth support and wire it in to the rest of sync.

Wire protocol is in flux and will change once the server has been
implemented.


BUG=

Review URL: https://codereview.chromium.org/278263003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@271212 0039d316-1c4b-4281-b951-d872f2087c98