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Currently some modules (push_messaging, background_fetch etc.) are
calling blink::SWRegistration::WebRegistration() to get a pointer to
blink::WebSWRegistration to continue their work there.
However, they use that blink::WebSWRegistration just to retrieve the
service worker registration id, i.e. what they really want is not
blink::WebSWRegistration, but just the registration id.

So, this CL removes blink::SWRegistration::WebRegistration() and
provides a new function blink::SWRegistration::RegistrationId() for
those users instead.

This CL is in preparation for https://crrev.com/c/1275300 which plans to
merge content::WebSWRegistrationImpl into blink::SWRegistration and
remove the public interface blink::WebSWRegistration completely.

BUG=789857,879019

Change-Id: Iafb245ec6f978dfaa294f58ee800d80c5ba60fac
Reviewed-on: https://chromium-review.googlesource.com/c/1275298
Commit-Queue: Leon Han <leon.han@intel.com>
Reviewed-by: Victor Costan <pwnall@chromium.org>
Reviewed-by: Peter Beverloo <peter@chromium.org>
Reviewed-by: Ian Clelland <iclelland@chromium.org>
Reviewed-by: Makoto Shimazu <shimazu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#599093}