Reflect the current state in Media Router Action icon.

chrome/browser/ui/views/media_router/media_router_ui_browsertest.cc

Index: chrome/browser/ui/views/media_router/media_router_ui_browsertest.cc
diff --git a/chrome/browser/ui/views/media_router/media_router_ui_browsertest.cc b/chrome/browser/ui/views/media_router/media_router_ui_browsertest.cc
index 0b17ab564db4f5d4c8520eeb86be523b2d1d2aa3..87a6f21bf8f3d558fb3914a3d103e8d2009057fa 100644
--- a/chrome/browser/ui/views/media_router/media_router_ui_browsertest.cc
+++ b/chrome/browser/ui/views/media_router/media_router_ui_browsertest.cc
@@ -44,6 +44,12 @@ class MediaRouterUIBrowserTest : public InProcessBrowserTest {
                               browser_actions_container));
   }
 
+  void TearDownOnMainThread() override {
+    toolbar_action_view_.reset();
+    media_router_action_.reset();
+    InProcessBrowserTest::TearDownOnMainThread();
+  }
+
   void OpenMediaRouterDialogAndWaitForNewWebContents() {
     content::TestNavigationObserver nav_observer(NULL);
     nav_observer.StartWatchingNewWebContents();