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Revert of Registration of DevTools bridge in GCD. (patchset #4 id:80001 of https://codereview.chromium.org/677843006/)

Reason for revert:
Only CL that landed before http://build.chromium.org/p/chromium.mac/waterfall?builder=Mac%20Builder broke. Going to revert this CL to try and get the builder working again.

Original issue's description:
> Registration of DevTools bridge in GCD.
>
> Code for registering and unregistering instance of DevTools bridge in GCD.
> GCDRegistrationFragment is able to perform registration including:
> 1. Asking user for desired account to register.
> 2. Requesting OAuth permissions for GCD (may show confirmation activity to the user).
> 3. Registration in Cloud Messages if needed.
>
> It also shows toasts with registration/unregistration results.
>
> GCDRegistrationFragment is absstract and has no views. Testing implementation
> shows button "Registed in GCD/Unregister (registered for ...)". Registration is not
> persistent yet.
>
> BUG=383418
> TEST=New button in main activity of DevToolsBridgeTest.apk: register/unregister.
>
> Committed: https://crrev.com/a2da02bd99d78de549b617510551ec5e1f7073d9
> Cr-Commit-Position: refs/heads/master@{#302251}

TBR=mnaganov@chromium.org,serya@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=383418

Review URL: https://codereview.chromium.org/693153003

Cr-Commit-Position: refs/heads/master@{#302254}