[Extensions Toolbar] Move some popup logic to be platform-agnostic

chrome/browser/ui/cocoa/extensions/extension_action_platform_delegate_cocoa.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 CHROME_BROWSER_UI_COCOA_EXTENSIONS_EXTENSION_ACTION_PLATFORM_DELEGATE_COCOA_H_
 #define CHROME_BROWSER_UI_COCOA_EXTENSIONS_EXTENSION_ACTION_PLATFORM_DELEGATE_COCOA_H_
 
 #include "base/mac/scoped_nsobject.h"
 #include "chrome/browser/ui/extensions/extension_action_platform_delegate.h"
 #include "content/public/browser/notification_observer.h"
@@ skipping 10 matching lines @@
   ExtensionActionPlatformDelegateCocoa(
       ExtensionActionViewController* controller);
   ~ExtensionActionPlatformDelegateCocoa() override;
 
  private:
   // ExtensionActionPlatformDelegate:
   gfx::NativeView GetPopupNativeView() override;
   bool IsMenuRunning() const override;
   void RegisterCommand() override;
   void OnDelegateSet() override;
-  bool IsShowingPopup() const override;
   void CloseActivePopup() override;
   void CloseOwnPopup() override;
-  bool ShowPopupWithUrl(
+  extensions::ExtensionViewHost* ShowPopupWithUrl(
       ExtensionActionViewController::PopupShowAction show_action,
       const GURL& popup_url,
       bool grant_tab_permissions) override;
 
   // content::NotificationObserver:
   void Observe(int type,
                const content::NotificationSource& source,
                const content::NotificationDetails& details) override;
 
   // Returns the popup shown by this extension action, if one exists.
   ExtensionPopupController* GetPopup() const;
 
   // Returns the delegate in its cocoa implementation.
   ToolbarActionViewDelegateCocoa* GetDelegateCocoa();
 
   // The main controller for this extension action.
   ExtensionActionViewController* controller_;
 
   content::NotificationRegistrar registrar_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionActionPlatformDelegateCocoa);
 };
 
 #endif  // CHROME_BROWSER_UI_COCOA_EXTENSIONS_EXTENSION_ACTION_PLATFORM_DELEGATE_COCOA_H_