Handle app custom icon via aura::Window property.

extensions/browser/app_window/app_window_registry.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef EXTENSIONS_BROWSER_APP_WINDOW_APP_WINDOW_REGISTRY_H_
 #define EXTENSIONS_BROWSER_APP_WINDOW_APP_WINDOW_REGISTRY_H_
 
 #include <list>
 #include <set>
 #include <string>
@@ skipping 19 matching lines @@
 
 // The AppWindowRegistry tracks the AppWindows for all platform apps for a
 // particular browser context.
 class AppWindowRegistry : public KeyedService,
                           public content::DevToolsAgentHostObserver {
  public:
   class Observer {
    public:
     // Called just after a app window was added.
     virtual void OnAppWindowAdded(AppWindow* app_window);
-    // Called when the window icon changes.
-    virtual void OnAppWindowIconChanged(AppWindow* app_window);
     // Called just after a app window was removed.
     virtual void OnAppWindowRemoved(AppWindow* app_window);
     // Called just after a app window was hidden. This is different from
     // window visibility as a minimize does not hide a window, but does make
     // it not visible.
     virtual void OnAppWindowHidden(AppWindow* app_window);
     // Called just after a app window was shown.
     virtual void OnAppWindowShown(AppWindow* app_window, bool was_hidden);
     // Called just after a app window was activated.
     virtual void OnAppWindowActivated(AppWindow* app_window);
 
    protected:
     virtual ~Observer();
   };
 
   typedef std::list<AppWindow*> AppWindowList;
   typedef AppWindowList::const_iterator const_iterator;
   typedef std::set<std::string> InspectedWindowSet;
 
   explicit AppWindowRegistry(content::BrowserContext* context);
   ~AppWindowRegistry() override;
 
   // Returns the instance for the given browser context, or NULL if none. This
   // is a convenience wrapper around
   // AppWindowRegistry::Factory::GetForBrowserContext().
   static AppWindowRegistry* Get(content::BrowserContext* context);
 
   void AddAppWindow(AppWindow* app_window);
-  void AppWindowIconChanged(AppWindow* app_window);
   // Called by |app_window| when it is activated.
   void AppWindowActivated(AppWindow* app_window);
   void AppWindowHidden(AppWindow* app_window);
   void AppWindowShown(AppWindow* app_window, bool was_hidden);
   void RemoveAppWindow(AppWindow* app_window);
 
   void AddObserver(Observer* observer);
   void RemoveObserver(Observer* observer);
 
   // Returns a set of windows owned by the application identified by app_id.
@@ skipping 73 matching lines @@
 
   content::BrowserContext* context_;
   AppWindowList app_windows_;
   InspectedWindowSet inspected_windows_;
   base::ObserverList<Observer> observers_;
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_BROWSER_APP_WINDOW_APP_WINDOW_REGISTRY_H_