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These buttons are now treated like other toolbar buttons and appear
alongside them.

This removes the separate container and BrowserViewLayout special casing
for it. This also removes the anticipated need to add theme support to
the container separately from the toolbar.

Bug: chromium:989131
Change-Id: I6cd01f8aec0984654cf70bc430301951f95ea612
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1829587
Commit-Queue: Peter Boström <pbos@chromium.org>
Commit-Queue: Taylor Bergquist <tbergquist@chromium.org>
Reviewed-by: Taylor Bergquist <tbergquist@chromium.org>
Auto-Submit: Peter Boström <pbos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#701336}