Rename ApplyNewSizeForWidget() to CancelPagePopupForWidget()

Make the API clear about it's intent, and only call it from RenderWidget
when the size changes, so the RenderView code is now just a pass-through
to the WebView.

R=avi@chromium.org

Change-Id: I6941e7d6bc152b09d8bf47ab392a312b67c215d6
Bug: 912193
Reviewed-on: https://chromium-review.googlesource.com/c/1426082
Commit-Queue: danakj <danakj@chromium.org>
Commit-Queue: Avi Drissman <avi@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Auto-Submit: danakj <danakj@chromium.org>
Cr-Commit-Position: refs/heads/master@{#624679}
5 files changed