The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/52b6fb0b9e562d7ec74a5c28db6df7835fe1cc7a

commit 52b6fb0b9e562d7ec74a5c28db6df7835fe1cc7a
Author: Adam Parker <amp@chromium.org>
Date: Fri May 18 18:20:06 2018

[Media Router] Remove CastLocalMedia feature flag

CastLocalMedia launched to 100% stable in M66, has been default enabled
on M67 and we are removing the flag in M68 as it is no longer needed.

Bug:  841934 
Change-Id: I79396d41b03e7430f5ab17b9a9770e82d44e96cb
Reviewed-on: https://chromium-review.googlesource.com/1062658
Reviewed-by: Robert Kaplow <rkaplow@chromium.org>
Reviewed-by: Derek Cheng <imcheng@chromium.org>
Commit-Queue: Adam Parker <amp@chromium.org>
Cr-Commit-Position: refs/heads/master@{#559960}
[modify] https://crrev.com/52b6fb0b9e562d7ec74a5c28db6df7835fe1cc7a/chrome/browser/media/router/media_router_feature.cc
[modify] https://crrev.com/52b6fb0b9e562d7ec74a5c28db6df7835fe1cc7a/chrome/browser/media/router/media_router_feature.h
[modify] https://crrev.com/52b6fb0b9e562d7ec74a5c28db6df7835fe1cc7a/chrome/browser/ui/media_router/media_router_ui_base.cc
[modify] https://crrev.com/52b6fb0b9e562d7ec74a5c28db6df7835fe1cc7a/chrome/test/media_router/media_router_e2e_browsertest.cc
[modify] https://crrev.com/52b6fb0b9e562d7ec74a5c28db6df7835fe1cc7a/chrome/test/media_router/media_router_integration_browsertest.cc
[modify] https://crrev.com/52b6fb0b9e562d7ec74a5c28db6df7835fe1cc7a/chrome/test/media_router/media_router_integration_browsertest.h
[modify] https://crrev.com/52b6fb0b9e562d7ec74a5c28db6df7835fe1cc7a/testing/variations/fieldtrial_testing_config.json