Fix tests in when MD is set to EXPERIMENTAL by default

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/material_design/material_design_controller.h"
@@ skipping 229 matching lines @@
 
 void BrowserNonClientFrameViewAsh::GetWindowMask(const gfx::Size& size,
                                                  gfx::Path* window_mask) {
   // Aura does not use window masks.
 }
 
 void BrowserNonClientFrameViewAsh::ResetWindowControls() {
   // Hide the caption buttons in immersive fullscreen when the tab light bar
   // is visible because it's confusing when the user hovers or clicks in the
   // top-right of the screen and hits one.
+  // TODO(yiyix): Update caption_button_container_'s visibility when Chrome OS

[msw, 2016/07/20 20:06:50]

nit: |caption_button_container_|'s

[msw, 2016/07/20 20:06:50]

q: Could you add MD-specific behavior now and avoid the TODO?

[yiyix, 2016/07/21 18:32:35]

Done.

[yiyix, 2016/07/21 18:32:35]

As we have discussed offline, there is no behavior to be added because
caption_button_container_ does not paint to screen in immersive full screen
mode.

+  // MD is enabled by default because it is currently dependent on
+  // |use_tab_indicators_| which is deprecated in MD.
   caption_button_container_->SetVisible(!UseImmersiveLightbarHeaderStyle());
   caption_button_container_->ResetWindowControls();
 }
 
 void BrowserNonClientFrameViewAsh::UpdateWindowIcon() {
   if (window_icon_)
     window_icon_->SchedulePaint();
 }
 
 void BrowserNonClientFrameViewAsh::UpdateWindowTitle() {
@@ skipping 325 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);
   }
 }