GitLab

SetDisplayMode was only overridden by frame widgets, move the
implementation into WebFrameWidgetBase.

BUG=1097816

Change-Id: I1a097cdd20bbabb589adbfcbc51f3516bb0c79e5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2314978
Commit-Queue: Dave Tapuska <dtapuska@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#792908}