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Now that there is a single FullscreenControllerObserver function for all
fullscreen-driven animations, we can remove duplicated code and
consolidate setup to a single function.

Bug: none
Cq-Include-Trybots: luci.chromium.try:ios-simulator-cronet;luci.chromium.try:ios-simulator-full-configs
Change-Id: I25a0b7f9797f2a62f79317f9f1ec8121da5dbf5c
Reviewed-on: https://chromium-review.googlesource.com/1053179
Commit-Queue: Kurt Horimoto <kkhorimoto@chromium.org>
Reviewed-by: Justin Cohen <justincohen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#590445}