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Resize media router (cast) dialog when browser changes size.

Most of the lines of change in this patch are just from splitting 
the declaration and definition for ConstrainedWebDialogDelegateViewViews.
This entire file is a painful morass of similarly named classes that are
all defined inline.

Bug: 766774
Change-Id: I4ebfece91d9398571232cf350a2dd27f117d88f4
Reviewed-on: https://chromium-review.googlesource.com/674179Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Evan Stade <estade@chromium.org>
Cr-Commit-Position: refs/heads/master@{#504397}