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Now that we have migrated the PageMsg_SetRendererPrefs legacy IPC to
Mojo and the ownership of blink::RendererPreferences to WebViewImpl,
we can also move this mojo RemoteSet to WebViewImpl as well, enabling
us to move even more code from RenderViewImpl into Blink.

Thus, this CL moves |renderer_preferences_watcher| into WebViewImpl by
defining a new WebView::RegisterRendererPreferenceWatcher() method that
would receive a CrossVariantMojoRemote as parameter to bind the remote
in Blink. With that in place WebViewImpl::SetRendererPreferences() does
no longer rely on RenderViewImpl::DidUpdateRendererPreferences() to
notify the watchers, getting us one step closer to entirely remove that
method from WebViewClient and its only implementor i.e. RenderViewImpl.

Bug: 1102442
Change-Id: If35c5302616e6411198965d35f55f04683a73db4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2498503
Commit-Queue: Mario Sanchez Prada <mario@igalia.com>
Reviewed-by: Dave Tapuska <dtapuska@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#821236}