[Media Router] Clean up issues related code.

chrome/browser/ui/webui/media_router/media_router_ui.h

Index: chrome/browser/ui/webui/media_router/media_router_ui.h
diff --git a/chrome/browser/ui/webui/media_router/media_router_ui.h b/chrome/browser/ui/webui/media_router/media_router_ui.h
index c78740e2157bb0e60c83acac86e2386f1e9ecc99..e8e2901c0e42e8527f79dc0b31fe898379245e8e 100644
--- a/chrome/browser/ui/webui/media_router/media_router_ui.h
+++ b/chrome/browser/ui/webui/media_router/media_router_ui.h
@@ -113,7 +113,7 @@ class MediaRouterUI : public ConstrainedWebDialogUI,
   void CloseRoute(const MediaRoute::Id& route_id);
 
   // Calls MediaRouter to add the given issue.
-  void AddIssue(const Issue& issue);
+  void AddIssue(const IssueInfo& issue);
 
   // Calls MediaRouter to clear the given issue.
   void ClearIssue(const Issue::Id& issue_id);
@@ -220,7 +220,8 @@ class MediaRouterUI : public ConstrainedWebDialogUI,
   // Called by |issues_observer_| when the top issue has changed.
   // If the UI is already initialized, notifies |handler_| to update the UI.
   // Ignored if the UI is not yet initialized.
-  void SetIssue(const Issue* issue);
+  void SetIssue(const Issue& issue);
+  void ClearIssue();
 
   // Called by |routes_observer_| when the set of active routes has changed.
   void OnRoutesUpdated(const std::vector<MediaRoute>& routes,