[Presentation API / Media Router] Clean up default pres URL logic.

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 3d7859f49b6f38cd254d0cb1ab151d15100703db..327e079604f5590d09f6140258727287aa1ee024 100644
--- a/chrome/browser/ui/webui/media_router/media_router_ui.h
+++ b/chrome/browser/ui/webui/media_router/media_router_ui.h
@@ -41,10 +41,10 @@ class MediaSinksObserver;
 class CreatePresentationSessionRequest;
 
 // Implements the chrome://media-router user interface.
-class MediaRouterUI
-    : public ConstrainedWebDialogUI,
-      public QueryResultManager::Observer,
-      public PresentationServiceDelegateImpl::DefaultMediaSourceObserver {
+class MediaRouterUI : public ConstrainedWebDialogUI,
+                      public QueryResultManager::Observer,
+                      public PresentationServiceDelegateImpl::
+                          DefaultPresentationRequestObserver {
  public:
   // |web_ui| owns this object and is used to initialize the base class.
   explicit MediaRouterUI(content::WebUI* web_ui);
@@ -163,20 +163,12 @@ class MediaRouterUI
   // Creates and sends an issue if route creation times out.
   void RouteCreationTimeout();
 
-  // Sets the source host name to be displayed in the UI.
-  // Gets cast modes from |query_result_manager_| and forwards it to UI.
-  // One of the Init* functions must have been called before.
-  void UpdateSourceHostAndCastModes(const GURL& frame_url);
+  // Initializes the dialog with mirroring sources derived from |initiator|.
+  void InitCommon(content::WebContents* initiator);
 
-  // Initializes the dialog with mirroring sources derived from |initiator|,
-  // and optional |default_source| and |default_frame_url| if any.
-  void InitCommon(content::WebContents* initiator,
-                  const MediaSource& default_source,
-                  const GURL& default_frame_url);
-
-  // PresentationServiceDelegateImpl::DefaultMediaSourceObserver
-  void OnDefaultMediaSourceChanged(const MediaSource& source,
-                                   const GURL& frame_url) override;
+  // PresentationServiceDelegateImpl::DefaultPresentationObserver
+  void OnDefaultPresentationChanged(
+      const PresentationRequest* presentation_request) override;
 
   // Owned by the |web_ui| passed in the ctor, and guaranteed to be deleted
   // only after it has deleted |this|.
@@ -208,7 +200,11 @@ class MediaRouterUI
 
   // If set, then the result of the next presentation route request will
   // be handled by this object.
-  scoped_ptr<CreatePresentationSessionRequest> presentation_request_;
+  scoped_ptr<CreatePresentationSessionRequest> create_session_request_;
+
+  // Set to the presentation request corresponding to the presentation cast
+  // mode, if supported. Otherwise set to nullptr.
+  scoped_ptr<PresentationRequest> presentation_request_;
 
   // It's possible for PresentationServiceDelegateImpl to be destroyed before
   // this class.