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This removes the extension_view_wrapper view that hosted the extensionview route controller.

This also removes the MediaRouterUIRouteController feature that was used for enabling/disabling the WebUI route controller; it will now always be enabled.
MediaRoute's custom_controller_path attribute will be removed in a separate patch.

Bug: 787588
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: I47ac68774dc47d4574125b0ba7730c7567443332
Reviewed-on: https://chromium-review.googlesource.com/775553Reviewed-by: Derek Cheng <imcheng@chromium.org>
Reviewed-by: mark a. foltz <mfoltz@chromium.org>
Commit-Queue: Takumi Fujimoto <takumif@chromium.org>
Cr-Commit-Position: refs/heads/master@{#520986}