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This updates the chrome://cast WebUI to redirect to the same Media Router
extension URL that users are sent to when they visit
https://www.google.com/chromecast/offers.

It doesn't need the logic to redirect to other parts of the extension any more,
since support for managing Cast devices via the extension has been removed.

Also, this WebUI is only accessible to users who manually navigate to
"chrome://cast" via the omnibox, which is a very small number.

This removes the last usage of <extensionview> so we can close Bug 982858.

It also removes the OWNERS file since sheretov@ is no longer with the Chromium
project.

Bug: 982858
Change-Id: I46110f41040fb90a84572c37c5cdad9069bb31a9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1713806
Commit-Queue: mark a. foltz <mfoltz@chromium.org>
Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Reviewed-by: Takumi Fujimoto <takumif@chromium.org>
Cr-Commit-Position: refs/heads/master@{#681359}