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 5608614a88c6a8773fea96d15b84df86c62cad9a..1f9a067808553a5e6587e12d3f75716def09dd5c 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;
 }
@@ -95,6 +97,7 @@ class MediaRouterMojoImpl : public MediaRouter,
  private:
   friend class MediaRouterFactory;
   friend class MediaRouterMojoTest;
+  friend class ::TestMediaRouterAction;
 
   FRIEND_TEST_ALL_PREFIXES(MediaRouterMojoExtensionTest,
                            DeferredBindingAndSuspension);