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This CL switches DaemonController to the same model that is used by PairingRegistry. DaemonController becomes a ref-counted object responsible for dispatching calls between threads. Platform-specific logic is implemented in non thread-safe delegate class. Most of the delegate's methods are synchronous and are running on a backgorund thread.

BUG=173509

Review URL: https://chromiumcodereview.appspot.com/23606019

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@222162 0039d316-1c4b-4281-b951-d872f2087c98