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This change caused the sole push_messaging layout test to fail :(.

> Hook PushMessagingMessageFilter up to GCMDriver
>
> Add plumbing for registration from push service-agnostic content layer
> to GCMDriver in chrome layer.
>
> To achieve this, GCMProfileService owns an implementation of a new
> PushMessagingService class, which can be used from the content layer.
>
> Based on mvanouwerkerk's prototype in https://codereview.chromium.org/186023002, but significantly refactored.
>
> BUG=350384
> TBR=benm@chromium.org

TBR=johnme@chromium.org
BUG=350384

Review URL: https://codereview.chromium.org/327423006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@276834 0039d316-1c4b-4281-b951-d872f2087c98