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

ui/native_theme/native_theme_dark_aura.cc

 // Copyright 2015 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_dark_aura.h"
 
 #include "ui/gfx/color_palette.h"
 
 namespace ui {
 
@@ skipping 112 matching lines @@
     case kColorId_TextfieldReadOnlyColor:
     case kColorId_TextfieldReadOnlyBackground:
     case kColorId_TooltipBackground:
     case kColorId_TooltipText:
     case kColorId_TreeBackground:
     case kColorId_TreeText:
     case kColorId_TreeSelectedText:
     case kColorId_TreeSelectedTextUnfocused:
     case kColorId_TreeSelectionBackgroundFocused:
     case kColorId_TreeSelectionBackgroundUnfocused:
-    case kColorId_TreeArrow:
     case kColorId_TableBackground:
     case kColorId_TableText:
     case kColorId_TableSelectedText:
     case kColorId_TableSelectedTextUnfocused:
     case kColorId_TableSelectionBackgroundFocused:
     case kColorId_TableSelectionBackgroundUnfocused:
     case kColorId_TableGroupingIndicatorColor:
     case kColorId_TableHeaderText:
     case kColorId_TableHeaderBackground:
     case kColorId_TableHeaderSeparator:
@@ skipping 13 matching lines @@
 
   NOTREACHED();
   return gfx::kPlaceholderColor;
 }
 
 NativeThemeDarkAura::NativeThemeDarkAura() : NativeThemeAura(false) {}
 
 NativeThemeDarkAura::~NativeThemeDarkAura() {}
 
 }  // namespace ui