Fix syncing of system theme on Linux

chrome/browser/themes/theme_service.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/themes/theme_service.h"
 
 #include "base/bind.h"
 #include "base/memory/ref_counted_memory.h"
 #include "base/message_loop/message_loop.h"
 #include "base/prefs/pref_service.h"
@@ skipping 101 matching lines @@
   gfx::Image image;
   if (theme_supplier_.get())
     image = theme_supplier_->GetImageNamed(id);
 
   if (image.IsEmpty())
     image = rb_.GetNativeImageNamed(id);
 
   return image;
 }
 
+bool ThemeService::IsSystemThemeDistinctFromDefaultTheme() const {
+  return false;
+}
+
 bool ThemeService::UsingSystemTheme() const {
   return UsingDefaultTheme();
 }
 
 gfx::ImageSkia* ThemeService::GetImageSkiaNamed(int id) const {
   gfx::Image image = GetImageNamed(id);
   if (image.IsEmpty())
     return NULL;
   // TODO(pkotwicz): Remove this const cast.  The gfx::Image interface returns
   // its images const. GetImageSkiaNamed() also should but has many callsites.
@@ skipping 468 matching lines @@
 void ThemeService::OnInfobarDestroyed() {
   number_of_infobars_--;
 
   if (number_of_infobars_ == 0)
     RemoveUnusedThemes(false);
 }
 
 ThemeSyncableService* ThemeService::GetThemeSyncableService() const {
   return theme_syncable_service_.get();
 }