Remove extension-to-component migration mechanism

chrome/browser/ui/toolbar/mock_component_toolbar_actions_factory.h

 // Copyright 2015 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_MOCK_COMPONENT_TOOLBAR_ACTIONS_FACTORY_H_
 #define CHROME_BROWSER_UI_TOOLBAR_MOCK_COMPONENT_TOOLBAR_ACTIONS_FACTORY_H_
 
 #include "base/macros.h"
 #include "chrome/browser/ui/toolbar/component_toolbar_actions_factory.h"
 #include "chrome/browser/ui/toolbar/toolbar_actions_model.h"
 
 class Browser;
 
 // Mock class used to substitute ComponentToolbarActionsFactory in tests.
 class MockComponentToolbarActionsFactory
     : public ComponentToolbarActionsFactory {
  public:
   static const char kActionIdForTesting[];
 
   explicit MockComponentToolbarActionsFactory(Browser* browser);
   ~MockComponentToolbarActionsFactory() override;
 
   // ComponentToolbarActionsFactory:
   std::set<std::string> GetInitialComponentIds(Profile* profile) override;
   std::unique_ptr<ToolbarActionViewController> GetComponentToolbarActionForId(
       const std::string& id,
       Browser* browser,
       ToolbarActionsBar* bar) override;
 
-  void RegisterComponentMigrations(
-      extensions::ComponentMigrationHelper* helper) const override;
-
-  void HandleComponentMigrations(extensions::ComponentMigrationHelper* helper,
-                                 Profile* profile) const override;
-
-  void set_migrated_extension_id(const extensions::ExtensionId& extension_id) {
-    migrated_extension_id_ = extension_id;
-  }
-
-  void set_migrated_feature_enabled(bool enabled) {
-    migrated_feature_enabled_ = enabled;
-  }
-
  private:
-  extensions::ExtensionId migrated_extension_id_;
-  bool migrated_feature_enabled_;
-
   DISALLOW_COPY_AND_ASSIGN(MockComponentToolbarActionsFactory);
 };
 
 #endif  // CHROME_BROWSER_UI_TOOLBAR_MOCK_COMPONENT_TOOLBAR_ACTIONS_FACTORY_H_