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WebView already exposes a variety of Resize() methods, as well as
VisualViewportSize(), so it's the right place for the method to live.

Note that this technically consitutes a slight behavior change, since previously
we were returning the main RenderWidget size, and now we're returning the
WebView size. For pre-render, this should be functionally identical.

Bug: 912193
Change-Id: I884f7c93d7a8ca4549f63689934197207b0cb85e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1817325
Auto-Submit: Erik Chen <erikchen@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Commit-Queue: Avi Drissman <avi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#698932}