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A runtime change to the kMediaRouterEnabled policy (managed preference) results
in undefined behavior and crashes.  This is a workaround to ensure that
MediaRouterEnabled() returns the same value for the lifetime of a profile.

Fixing the Media Router to be enabled/disabled dynamically is possible, but will
be blocked on extension removal (specifically the MediaRouteProvider mojo
interface).

Tested by manually enabling/disabling the policy while running Chrome and
ensuring no crashes or partially-enabled UI states happen.

Bug: 1076831
Change-Id: I966a58196f92be40aed8771282c27f762102da6e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2597752
Commit-Queue: mark a. foltz <mfoltz@chromium.org>
Reviewed-by: Takumi Fujimoto <takumif@chromium.org>
Cr-Commit-Position: refs/heads/master@{#838705}