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This CL adds a flag that forces the CRWWebViewContentView to always use
the WKScrollView's contentInset rather than resizing the frame for
fullscreen events.

Bug: none
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: I70f2d814a15a24a6a0df3874565d8a41325a162a
Reviewed-on: https://chromium-review.googlesource.com/1009163
Commit-Queue: Kurt Horimoto <kkhorimoto@chromium.org>
Reviewed-by: Peter Lee <pkl@chromium.org>
Cr-Commit-Position: refs/heads/master@{#550085}