[ash-md] Erases the pre-MD code path for Overview Mode

chrome/browser/ui/views/frame/browser_non_client_frame_view_ash.cc

 // Copyright 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/views/frame/browser_non_client_frame_view_ash.h"
 
 #include <algorithm>
 
 #include "ash/common/ash_layout_constants.h"
 #include "ash/common/frame/caption_buttons/frame_caption_button_container_view.h"
 #include "ash/common/frame/default_header_painter.h"
 #include "ash/common/frame/frame_border_hit_test.h"
 #include "ash/common/frame/header_painter_util.h"
-#include "ash/common/material_design/material_design_controller.h"
 #include "ash/common/wm_lookup.h"
 #include "ash/common/wm_shell.h"
 #include "ash/common/wm_window.h"
 #include "build/build_config.h"
 #include "chrome/app/chrome_command_ids.h"
 #include "chrome/browser/extensions/extension_util.h"
 #include "chrome/browser/profiles/profiles_state.h"
 #include "chrome/browser/themes/theme_properties.h"
 #include "chrome/browser/ui/ash/multi_user/multi_user_window_manager.h"
 #include "chrome/browser/ui/browser.h"
@@ skipping 344 matching lines @@
     frame()->GetRootView()->Layout();
   }
 }
 
 ///////////////////////////////////////////////////////////////////////////////
 // ash::ShellObserver:
 
 void BrowserNonClientFrameViewAsh::OnOverviewModeStarting() {
   frame()->GetNativeWindow()->SetProperty(aura::client::kTopViewColor,
                                           GetFrameColor());
-  if (ash::MaterialDesignController::IsOverviewMaterial())
-    caption_button_container_->SetVisible(false);
+  caption_button_container_->SetVisible(false);
 }
 
 void BrowserNonClientFrameViewAsh::OnOverviewModeEnded() {
-  if (ash::MaterialDesignController::IsOverviewMaterial())
-    caption_button_container_->SetVisible(true);
+  caption_button_container_->SetVisible(true);
 }
 
 void BrowserNonClientFrameViewAsh::OnMaximizeModeStarted() {
   caption_button_container_->UpdateSizeButtonVisibility();
   InvalidateLayout();
   frame()->client_view()->InvalidateLayout();
   frame()->GetRootView()->Layout();
 }
 
 void BrowserNonClientFrameViewAsh::OnMaximizeModeEnded() {
@@ skipping 181 matching lines @@
     // TODO(pkasting): The "2 *" part of this makes no sense to me.
     canvas->TileImageInt(*right, 0, 0, w - (2 * kClientEdgeThickness) - img_w,
                          img_y, img_w, img_h);
 
     // Toolbar/content separator.
     toolbar_bounds.Inset(kClientEdgeThickness, h - kClientEdgeThickness,
                          kClientEdgeThickness, 0);
     canvas->FillRect(toolbar_bounds, separator_color);
   }
 }