Reflect the current state in Media Router Action icon.

chrome/browser/media/router/media_router_mojo_impl.h

Index: chrome/browser/media/router/media_router_mojo_impl.h
diff --git a/chrome/browser/media/router/media_router_mojo_impl.h b/chrome/browser/media/router/media_router_mojo_impl.h
index 723163ec4d159197a67664a3b28b7c95c26d0eb2..5510ea68aa995dddee69d2030ba3b27d5ca6793d 100644
--- a/chrome/browser/media/router/media_router_mojo_impl.h
+++ b/chrome/browser/media/router/media_router_mojo_impl.h
@@ -23,6 +23,8 @@
 #include "chrome/browser/media/router/media_router.h"
 #include "chrome/browser/media/router/media_router.mojom.h"
 
+class TestMediaRouterAction;
+
 namespace content {
 class BrowserContext;
 }
@@ -99,6 +101,7 @@ class MediaRouterMojoImpl : public MediaRouter,
  private:
   friend class MediaRouterFactory;
   friend class MediaRouterMojoTest;
+  friend class ::TestMediaRouterAction;
 
   FRIEND_TEST_ALL_PREFIXES(MediaRouterMojoExtensionTest,
                            DeferredBindingAndSuspension);