Revert of 🏠 Polish bottom sheet content transitions (patchset #1 id:1 of https://codereview.chromium.org/2839673002/ )

Reason for revert:
Appears to be causing multiple chrome_public_test_apk failures on Marshmallow 64 bit Tester.
crbug.com/715336

Original issue's description:
> [Home] Polish bottom sheet content transitions
>
> This change adds animation when transitioning between bottom sheet
> content. The existing view is faded out completely before the new
> view is faded in. The animation is applied to both the sheet content
> and the toolbar view.
>
> Notably, the onContentChanged() event is now called when the
> transition animation has finished instead of immediately when
> showContent(...) is called.
>
> BUG=702717
>
> Review-Url: https://codereview.chromium.org/2839673002
> Cr-Commit-Position: refs/heads/master@{#466780}
> Committed: https://chromium.googlesource.com/chromium/src/+/419509cbf0ac3a8a8595b3ce9e56daf75e5c2f0c

TBR=twellington@chromium.org,mdjones@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=702717

Review-Url: https://codereview.chromium.org/2838313003
Cr-Commit-Position: refs/heads/master@{#467301}
2 files changed