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This CL moves the classes for BottomControls MVC component plus
its layout xml to chrome/browser/ui/android/toolbar/.

Following dependencies on chrome_java were removed:

- ShareDelegate - was not in use.
- TabGroupUi - split to BottomControlsContentDelegate and extend
               from it.


Bug: 1127732
Change-Id: I40a630eba6924b65a3b90b8ab95f2814dacb70d4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2610411
Commit-Queue: Jinsuk Kim <jinsukkim@chromium.org>
Reviewed-by: Mei Liang <meiliang@chromium.org>
Reviewed-by: Matthew Jones <mdjones@chromium.org>
Reviewed-by: Theresa  <twellington@chromium.org>
Cr-Commit-Position: refs/heads/master@{#841911}