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This CL applies the BVCContainer transforms directly to it instead of
BVC applying them to its superview. Previous approach had a race
condition where in some cases the BVC was already removed from it's
container leaving the BVCContainer in the previous state.

It also contains a few readability fixes in the involved methods.

Bug: 1164978
Change-Id: I6e6cce85dca0478a062f04f7ba93aba14a051d74
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2629968Reviewed-by: Gauthier Ambard <gambard@chromium.org>
Reviewed-by: Robbie Gibson <rkgibson@google.com>
Commit-Queue: Javier Flores <javierrobles@chromium.org>
Cr-Commit-Position: refs/heads/master@{#844929}