Sort out build dependencies for LinuxUI.

chrome/browser/ui/libgtk2ui/gtk2_ui.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 "chrome/browser/ui/libgtk2ui/gtk2_ui.h"
 
 #include <set>
 
 #include "base/command_line.h"
 #include "base/i18n/rtl.h"
@@ skipping 316 matching lines @@
 bool Gtk2UI::GetColor(int id, SkColor* color) const {
   ColorMap::const_iterator it = colors_.find(id);
   if (it != colors_.end()) {
     *color = it->second;
     return true;
   }
 
   return false;
 }
 
+ui::NativeTheme* Gtk2UI::GetNativeTheme() const {
+  return NULL;
+}
+
 ui::SelectFileDialog* Gtk2UI::CreateSelectFileDialog(
     ui::SelectFileDialog::Listener* listener,
     ui::SelectFilePolicy* policy) const {
   return SelectFileDialogImpl::Create(listener, policy);
 }
 
 void Gtk2UI::GetScrollbarColors(GdkColor* thumb_active_color,
                                 GdkColor* thumb_inactive_color,
                                 GdkColor* track_color) {
   const GdkColor* theme_thumb_active = NULL;
@@ skipping 622 matching lines @@
 
 void Gtk2UI::ClearAllThemeData() {
   STLDeleteValues(&gtk_images_);
 }
 
 }  // namespace libgtk2ui
 
 ui::LinuxUI* BuildGtk2UI() {
   return new libgtk2ui::Gtk2UI;
 }