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This CL moves WebContents AutoResizing behavior into Webview rather than
handling it in subclasses of Webview. This will enable the addition of
other AutoResizing Webviews without the need for a custom subclass.

Bug: 849551
Change-Id: I2a31a57180ff43b6cda9827ba9d19dcddcd1db24
Reviewed-on: https://chromium-review.googlesource.com/1127216
Commit-Queue: calamity <calamity@chromium.org>
Reviewed-by: Trent Apted <tapted@chromium.org>
Cr-Commit-Position: refs/heads/master@{#576404}