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And adds support for BrowserFragmentControllerImpl containing multiple
BrowserControllers. This patch doesn't contain support for creating
more than one BrowserController in a BrowserFragment. That will come
next.

The reason I'm seperating the Views is to support multiple browsers,
and it seems as though we should support deleting the view, which
is easier with a self contained class.

BUG=none
TEST=none

Change-Id: Idc4a6b2405350b5f9f84d1c046c6d8f839a87ac6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1894749
Auto-Submit: Scott Violet <sky@chromium.org>
Reviewed-by: Bo <boliu@chromium.org>
Commit-Queue: Bo <boliu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#712115}