The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/a2c2c3e846345cc803c7cf14c210812eff757c22

commit a2c2c3e846345cc803c7cf14c210812eff757c22
Author: takumif <takumif@chromium.org>
Date: Thu Jun 15 20:44:43 2017

[Media Router] Remove an extra call to load extensionview

Before the WebUI route controller patch, we were loading the extensionview only
when there were route changes. After the patch we are loading it on ready() as
well, which causes the extensionview to crash if casting to Hangouts.

BUG= 733432 
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:closure_compilation

Review-Url: https://codereview.chromium.org/2938093002
Cr-Commit-Position: refs/heads/master@{#479819}

[modify] https://crrev.com/a2c2c3e846345cc803c7cf14c210812eff757c22/chrome/browser/resources/media_router/elements/route_details/extension_view_wrapper/extension_view_wrapper.js