Remove extension-to-component migration mechanism

chrome/browser/ui/toolbar/component_toolbar_actions_factory.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_TOOLBAR_COMPONENT_TOOLBAR_ACTIONS_FACTORY_H_
 #define CHROME_BROWSER_UI_TOOLBAR_COMPONENT_TOOLBAR_ACTIONS_FACTORY_H_
 
 #include <memory>
 #include <set>
 #include <string>
 
 #include "base/macros.h"
 #include "chrome/browser/ui/toolbar/toolbar_actions_bar.h"
 
 class Browser;
 class Profile;
 class ToolbarActionViewController;
 
-namespace extensions {
-class ComponentMigrationHelper;
-}  // extensions
-
 // The registry for all component toolbar actions. Component toolbar actions
 // are actions that live in the toolbar (like extension actions), but are
 // components of chrome, such as ChromeCast.
 class ComponentToolbarActionsFactory {
  public:
   // Component action IDs.
   static const char kMediaRouterActionId[];
 
   ComponentToolbarActionsFactory();
   virtual ~ComponentToolbarActionsFactory();
 
   static ComponentToolbarActionsFactory* GetInstance();
 
   // Returns a vector of IDs of the component actions.
   virtual std::set<std::string> GetInitialComponentIds(Profile* profile);
 
   // Returns a collection of controllers for component actions. Declared
   // virtual for testing.
   virtual std::unique_ptr<ToolbarActionViewController>
   GetComponentToolbarActionForId(const std::string& id,
                                  Browser* browser,
                                  ToolbarActionsBar* bar);
 
-  // Registers component actions that are migrating from extensions.
-  virtual void RegisterComponentMigrations(
-      extensions::ComponentMigrationHelper* helper) const;
-
-  // Synchronizes component action visibility and extension install status.
-  virtual void HandleComponentMigrations(
-      extensions::ComponentMigrationHelper* helper,
-      Profile* profile) const;
-
   // Sets the factory to use for testing purposes.
   // Ownership remains with the caller.
   static void SetTestingFactory(ComponentToolbarActionsFactory* factory);
 
  private:
   DISALLOW_COPY_AND_ASSIGN(ComponentToolbarActionsFactory);
 };
 
 #endif  // CHROME_BROWSER_UI_TOOLBAR_COMPONENT_TOOLBAR_ACTIONS_FACTORY_H_