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This CL changes the way the frame of the WebView is changed, moving the
implementation to the FullscreenMediator.

Bug: 836730
Cq-Include-Trybots: luci.chromium.try:ios-simulator-cronet;luci.chromium.try:ios-simulator-full-configs
Change-Id: Idc8b339ea61d4024268549789f18ec10c64f0d54
Reviewed-on: https://chromium-review.googlesource.com/1194226
Commit-Queue: Gauthier Ambard <gambard@chromium.org>
Reviewed-by: Kurt Horimoto <kkhorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#587601}