MacViews: Consolidate flags. Just use --secondary-ui-md to enable MacViews.

chrome/browser/ui/cocoa/task_manager_mac.mm

 // Copyright (c) 2012 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 "chrome/browser/ui/cocoa/task_manager_mac.h"
 
 #include <stddef.h>
 
 #include <algorithm>
 #include <vector>
 
 #include "base/mac/bundle_locations.h"
 #include "base/macros.h"
 #include "base/strings/sys_string_conversions.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/chrome_notification_types.h"
 #include "chrome/browser/task_manager/task_manager_interface.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_dialogs.h"
 #import "chrome/browser/ui/cocoa/window_size_autosaver.h"
 #include "chrome/browser/ui/task_manager/task_manager_columns.h"
 #include "chrome/common/pref_names.h"
 #include "chrome/grit/generated_resources.h"
 #include "components/prefs/pref_service.h"
 #include "content/public/browser/notification_service.h"
 #include "content/public/browser/notification_source.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 #include "ui/base/l10n/l10n_util_mac.h"
+#include "ui/base/material_design/material_design_controller.h"
 #include "ui/gfx/image/image_skia.h"
 #include "ui/gfx/image/image_skia_util_mac.h"
 
 namespace {
 
 NSString* ColumnIdentifier(int id) {
   return [NSString stringWithFormat:@"%d", id];
 }
 
 }  // namespace
@@ skipping 593 matching lines @@
   if (instance_)
     [instance_->window_controller_ close];
 }
 
 }  // namespace task_manager
 
 namespace chrome {
 
 // Declared in browser_dialogs.h.
 task_manager::TaskManagerTableModel* ShowTaskManager(Browser* browser) {
-  if (chrome::ToolkitViewsDialogsEnabled())
+  if (ui::MaterialDesignController::IsSecondaryUiMaterial())
     return chrome::ShowTaskManagerViews(browser);
 
   return task_manager::TaskManagerMac::Show();
 }
 
 void HideTaskManager() {
-  if (chrome::ToolkitViewsDialogsEnabled()) {
+  if (ui::MaterialDesignController::IsSecondaryUiMaterial()) {
     chrome::HideTaskManagerViews();
     return;
   }
 
   task_manager::TaskManagerMac::Hide();
 }
 
 }  // namespace chrome