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This CL modernizes the HistoryCoordinator
 - to use |browser| in the initializer
 - to remove the public property for browserstate and dispatcher.
 - to use self.browser to get browserstate and dispatcher values.

Bug: 1029346, 1048408
Change-Id: I303cc9ce692c15f582f8648a8049ea2251148746
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2063128Reviewed-by: Mark Cogan <marq@chromium.org>
Commit-Queue: Nazerke Kalidolda <nazerke@google.com>
Cr-Commit-Position: refs/heads/master@{#742598}