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

ash/test/ash_md_test_base.cc

-// Copyright 2016 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.
-
-#include "ash/test/ash_md_test_base.h"
-
-#include "ash/common/shelf/shelf_constants.h"
-#include "ash/common/test/material_design_controller_test_api.h"
-
-namespace ash {
-namespace test {
-
-AshMDTestBase::AshMDTestBase() {}
-
-AshMDTestBase::~AshMDTestBase() {}
-
-void AshMDTestBase::SetUp() {
-  int non_md_shelf_size = 0;
-  int non_md_auto_hide_shelf_size = 0;
-  int md_shelf_size = 0;
-  int md_auto_hide_shelf_size = 0;
-
-  {
-    test::MaterialDesignControllerTestAPI md_state(
-        MaterialDesignController::Mode::NON_MATERIAL);
-    non_md_shelf_size = GetShelfConstant(SHELF_SIZE);
-    non_md_auto_hide_shelf_size = GetShelfConstant(SHELF_INSETS_FOR_AUTO_HIDE);
-  }
-
-  {
-    test::MaterialDesignControllerTestAPI md_state(GetParam());
-    md_shelf_size = GetShelfConstant(SHELF_SIZE);
-    md_auto_hide_shelf_size = GetShelfConstant(SHELF_INSETS_FOR_AUTO_HIDE);
-  }
-
-  md_maximized_window_height_offset_ = non_md_shelf_size - md_shelf_size;
-  md_auto_hidden_shelf_height_offset_ =
-      non_md_auto_hide_shelf_size - md_auto_hide_shelf_size;
-
-  set_material_mode(GetParam());
-
-  AshTestBase::SetUp();
-}
-
-int AshMDTestBase::GetMdMaximizedWindowHeightOffset() {
-  return md_maximized_window_height_offset_;
-}
-
-int AshMDTestBase::GetMdAutoHiddenShelfHeightOffset() {
-  return md_auto_hidden_shelf_height_offset_;
-}
-
-}  // namespace test
-}  // namespace ash