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The WM_SIZING message is now handled by HWNDMessageHandler. When the
aspect ratio is set for a window on Windows OS, the handler will adjust
the final RECT bounds to adhere to the given aspect ratio.

Bug: 853276
Change-Id: I54099581012d3f59e3d0535ed1285a25bb512cd9
Reviewed-on: https://chromium-review.googlesource.com/1136226
Commit-Queue: apacible <apacible@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Mounir Lamouri <mlamouri@chromium.org>
Cr-Commit-Position: refs/heads/master@{#580626}