Consolidate ShouldUseNativeFrame/AlwaysUseNativeFrame/UseNativeFrame spaghetti.

chrome/browser/ui/views/tabs/tab_strip.cc

 // Copyright (c) 2011 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/tabs/tab_strip.h"
 
 #include <algorithm>
 
 #include "base/compiler_specific.h"
 #include "base/stl_util-inl.h"
@@ skipping 284 matching lines @@
     } else if (!tab->IsActive()) {
       if (!tab->IsSelected())
         tab->Paint(canvas);
       else
         selected_tabs.push_back(tab);
     } else {
       active_tab = tab;
     }
   }
 
-  if (GetWindow()->non_client_view()->UseNativeFrame()) {
+  if (GetWindow()->ShouldUseNativeFrame()) {
     bool multiple_tabs_selected = (!selected_tabs.empty() ||
                                    tabs_dragging.size() > 1);
     // Make sure non-active tabs are somewhat transparent.
     SkPaint paint;
     // If there are multiple tabs selected, fade non-selected tabs more to make
     // the selected tabs more noticable.
     paint.setColor(SkColorSetARGB(
                        multiple_tabs_selected ? 150 : 200, 255, 255, 255));
     paint.setXfermodeMode(SkXfermode::kDstIn_Mode);
     paint.setStyle(SkPaint::kFill_Style);
@@ skipping 704 matching lines @@
 int TabStrip::GetAvailableWidthForTabs(Tab* last_tab) const {
   return last_tab->x() + last_tab->width();
 }
 
 bool TabStrip::IsPointInTab(Tab* tab,
                             const gfx::Point& point_in_tabstrip_coords) {
   gfx::Point point_in_tab_coords(point_in_tabstrip_coords);
   View::ConvertPointToView(this, tab, &point_in_tab_coords);
   return tab->HitTest(point_in_tab_coords);
 }