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This CL removes public properties for WebStateList, BrowserState and
dispatcher values and updates the coordinators implementation to get
them from self.browser.
The refactored coordinators:
 - Adaptive Toolbar Coordinator
 - Primary Toolbar Coordinator
 - Secondary Toolbar Coordinator.

Bug: 1029346, 1047873, 1048663, 1048674

Change-Id: I228ac98252cb315e84914bc5d5539168260b8faa
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2013280
Commit-Queue: Nazerke Kalidolda <nazerke@google.com>
Reviewed-by: Mark Cogan <marq@chromium.org>
Reviewed-by: Javier Ernesto Flores Robles <javierrobles@chromium.org>
Cr-Commit-Position: refs/heads/master@{#738584}