Gut ash::MaterialDesignController, and remove the about:flags entry.

ash/test/ash_test_helper.h

 // Copyright 2013 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 ASH_TEST_ASH_TEST_HELPER_H_
 #define ASH_TEST_ASH_TEST_HELPER_H_
 
 #include <memory>
 
-#include "ash/common/material_design/material_design_controller.h"
-#include "ash/common/test/material_design_controller_test_api.h"
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 
 namespace aura {
 class Window;
 }  // namespace aura
 
 namespace ui {
 class ScopedAnimationDurationScaleMode;
 }  // namespace ui
@@ skipping 13 matching lines @@
 
 // A helper class that does common initialization required for Ash. Creates a
 // root window and an ash::Shell instance with a test delegate.
 class AshTestHelper {
  public:
   explicit AshTestHelper(AshTestEnvironment* ash_test_environment);
   ~AshTestHelper();
 
   // Creates the ash::Shell and performs associated initialization.  Set
   // |start_session| to true if the user should log in before the test is run.
-  // |material_mode| determines the material design mode to be used for the
-  // tests. If |material_mode| is UNINITIALIZED, the value from command line
-  // switches is used.
-  void SetUp(bool start_session, MaterialDesignController::Mode material_mode);
+  void SetUp(bool start_session);
 
   // Destroys the ash::Shell and performs associated cleanup.
   void TearDown();
 
   // Returns a root Window. Usually this is the active root Window, but that
   // method can return NULL sometimes, and in those cases, we fall back on the
   // primary root Window.
   aura::Window* CurrentContext();
 
   void RunAllPendingInMessageLoop();
@@ skipping 20 matching lines @@
   TestScreenshotDelegate* test_screenshot_delegate_;
 
   std::unique_ptr<::wm::WMState> wm_state_;
   std::unique_ptr<AshTestViewsDelegate> views_delegate_;
 
   // Check if DBus Thread Manager was initialized here.
   bool dbus_thread_manager_initialized_;
   // Check if Bluez DBus Manager was initialized here.
   bool bluez_dbus_manager_initialized_;
 
-  std::unique_ptr<test::MaterialDesignControllerTestAPI> material_design_state_;
-
   DISALLOW_COPY_AND_ASSIGN(AshTestHelper);
 };
 
 }  // namespace test
 }  // namespace ash
 
 #endif  // ASH_TEST_ASH_TEST_HELPER_H_