[MediaRouter] Moved the code useful for Android to MediaRouterDialogController

chrome/browser/media/android/router/media_router_dialog_controller_android.h

Index: chrome/browser/media/android/router/media_router_dialog_controller_android.h
diff --git a/chrome/browser/media/android/router/media_router_dialog_controller_android.h b/chrome/browser/media/android/router/media_router_dialog_controller_android.h
index f02dc33b662976d62d9935e2f838213d1266a6e5..ca06b2e9650c1d5ae482e2af6f8ff0e25f0baf84 100644
--- a/chrome/browser/media/android/router/media_router_dialog_controller_android.h
+++ b/chrome/browser/media/android/router/media_router_dialog_controller_android.h
@@ -7,7 +7,6 @@
 
 #include "base/macros.h"
 #include "chrome/browser/media/router/media_router_dialog_controller.h"
-#include "content/public/browser/web_contents_observer.h"
 #include "content/public/browser/web_contents_user_data.h"
 
 namespace media_router {
@@ -22,9 +21,8 @@ class MediaRouterDialogControllerAndroid
   static MediaRouterDialogControllerAndroid* GetOrCreateForWebContents(
       content::WebContents* web_contents);
 
-  // MediaRouterDialogController implementation.
-  bool ShowMediaRouterDialogForPresentation(
-      scoped_ptr<CreatePresentationSessionRequest> request) override;
+  // MediaRouterDialogController:
+  bool IsShowingMediaRouterDialog() override;
 
  private:
   friend class content::WebContentsUserData<MediaRouterDialogControllerAndroid>;
@@ -34,7 +32,8 @@ class MediaRouterDialogControllerAndroid
   explicit MediaRouterDialogControllerAndroid(
       content::WebContents* web_contents);
 
-  base::ThreadChecker thread_checker_;
+  // MediaRouterDialogController:
+  void CreateMediaRouterDialog() override;
 
   DISALLOW_COPY_AND_ASSIGN(MediaRouterDialogControllerAndroid);
 };