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This CL removes all changes from media_router, which were causing flakey
tests. The intention is to reland those separately as a follow-up CL.

Bug: 832177
Cq-Include-Trybots: luci.chromium.try:closure_compilation
Change-Id: I68c653f4e492807988cdb09c2387e42111bd8db7
Reviewed-on: https://chromium-review.googlesource.com/1106419
Commit-Queue: Scott Chen <scottchen@chromium.org>
Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#568640}