Reuse submenu arrow images for trees (like the edit bookmark tree).

ui/native_theme/native_theme_win.cc

 // 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 "ui/native_theme/native_theme_win.h"
 
 #include <windows.h>
 #include <stddef.h>
 #include <uxtheme.h>
 #include <vsstyle.h>
@@ skipping 560 matching lines @@
       return system_colors_[COLOR_WINDOWTEXT];
     case kColorId_TreeSelectedText:
       return system_colors_[COLOR_HIGHLIGHTTEXT];
     case kColorId_TreeSelectedTextUnfocused:
       return system_colors_[COLOR_BTNTEXT];
     case kColorId_TreeSelectionBackgroundFocused:
       return system_colors_[COLOR_HIGHLIGHT];
     case kColorId_TreeSelectionBackgroundUnfocused:
       return system_colors_[IsUsingHighContrastTheme() ?
                               COLOR_MENUHIGHLIGHT : COLOR_BTNFACE];
-    case kColorId_TreeArrow:
-      return system_colors_[COLOR_WINDOWTEXT];
 
     // Table
     case kColorId_TableBackground:
       return system_colors_[COLOR_WINDOW];
     case kColorId_TableText:
       return system_colors_[COLOR_WINDOWTEXT];
     case kColorId_TableSelectedText:
       return system_colors_[COLOR_HIGHLIGHTTEXT];
     case kColorId_TableSelectedTextUnfocused:
       return system_colors_[COLOR_BTNTEXT];
@@ skipping 1510 matching lines @@
     break;
   case LAST:
     NOTREACHED();
     break;
   }
   theme_handles_[theme_name] = handle;
   return handle;
 }
 
 }  // namespace ui