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

chrome/browser/ui/libgtkui/native_theme_gtk3.cc

 // Copyright 2016 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/libgtkui/native_theme_gtk3.h"
 
 #include <gtk/gtk.h>
 
 #include "chrome/browser/ui/libgtkui/chrome_gtk_frame.h"
 #include "chrome/browser/ui/libgtkui/chrome_gtk_menu_subclasses.h"
@@ skipping 213 matching lines @@
     case ui::NativeTheme::kColorId_TooltipText:
       return color_utils::GetReadableColor(GetFgColor("GtkTooltip#tooltip"),
                                            GetBgColor("GtkTooltip#tooltip"));
 
     // Trees and Tables (implemented on GTK using the same class)
     case ui::NativeTheme::kColorId_TableBackground:
     case ui::NativeTheme::kColorId_TreeBackground:
       return GetBgColor("GtkTreeView#treeview.view .view.cell");
     case ui::NativeTheme::kColorId_TableText:
     case ui::NativeTheme::kColorId_TreeText:
-    case ui::NativeTheme::kColorId_TreeArrow:
     case ui::NativeTheme::kColorId_TableGroupingIndicatorColor:
       return GetFgColor("GtkTreeView#treeview.view .view.cell GtkLabel");
     case ui::NativeTheme::kColorId_TableSelectedText:
     case ui::NativeTheme::kColorId_TableSelectedTextUnfocused:
     case ui::NativeTheme::kColorId_TreeSelectedText:
     case ui::NativeTheme::kColorId_TreeSelectedTextUnfocused:
       return GetFgColor(
           "GtkTreeView#treeview.view .view.cell:selected:focus GtkLabel");
     case ui::NativeTheme::kColorId_TableSelectionBackgroundFocused:
     case ui::NativeTheme::kColorId_TableSelectionBackgroundUnfocused:
@@ skipping 298 matching lines @@
 
   if (frame_top_area.incognito) {
     bitmap = SkBitmapOperations::CreateHSLShiftedBitmap(
         bitmap, kDefaultTintFrameIncognito);
   }
 
   canvas->drawBitmap(bitmap, rect.x(), rect.y());
 }
 
 }  // namespace libgtkui