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WebLayer won't implement notifications for now, so notifications code
is getting left in //chrome. These dependencies are easy to remove
and replace with generic permissions/prefs code, which will ease the
componentization of WebsitePreferenceBridge.

1. Use PrefServiceBridge to directly set the quiet notification
   preference instead of adding a specific jni interface in
   WebsitePreferenceBridge.
2. Use HostContentSettingsMap to set the notification preference by
   ContentSettingsType rather than using the (thin) wrapper provided
   by NotificationPermissionContext

Bug: 1058600
Change-Id: I450946b545408dbeb1abec6508b3e13f8effb9bc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2122914
Commit-Queue: Evan Stade <estade@chromium.org>
Reviewed-by: Natalie Chouinard <chouinard@chromium.org>
Reviewed-by: Balazs Engedy <engedy@chromium.org>
Reviewed-by: Finnur Thorarinsson <finnur@chromium.org>
Cr-Commit-Position: refs/heads/master@{#756021}