Remove some unused theming code for GTK.

chrome/browser/themes/theme_service_aurax11.cc

 // Copyright 2013 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/themes/theme_service_aurax11.h"
 
 #include "base/bind.h"
 #include "base/macros.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/themes/custom_theme_supplier.h"
@@ skipping 47 matching lines @@
 
 bool SystemThemeX11::GetTint(int id, color_utils::HSL* hsl) const {
   return linux_ui_ && linux_ui_->GetTint(id, hsl);
 }
 
 bool SystemThemeX11::GetColor(int id, SkColor* color) const {
   return linux_ui_ && linux_ui_->GetColor(id, color);
 }
 
 gfx::Image SystemThemeX11::GetImageNamed(int id) {
-  return linux_ui_ ? linux_ui_->GetThemeImageNamed(id) : gfx::Image();
+  return gfx::Image();
 }
 
 bool SystemThemeX11::HasCustomImage(int id) const {
-  return linux_ui_ && linux_ui_->HasCustomImage(id);
+  return false;
 }
 
 SystemThemeX11::~SystemThemeX11() {}
 
 }  // namespace
 
 ThemeServiceAuraX11::ThemeServiceAuraX11() {}
 
 ThemeServiceAuraX11::~ThemeServiceAuraX11() {}
 
@@ skipping 11 matching lines @@
 
 bool ThemeServiceAuraX11::UsingDefaultTheme() const {
   return ThemeService::UsingDefaultTheme() && !UsingSystemTheme();
 }
 
 bool ThemeServiceAuraX11::UsingSystemTheme() const {
   const CustomThemeSupplier* theme_supplier = get_theme_supplier();
   return theme_supplier &&
          theme_supplier->get_theme_type() == CustomThemeSupplier::NATIVE_X11;
 }