Move c/c/e/extension_set to top-level extensions/

chrome/browser/themes/theme_service.cc

Index: chrome/browser/themes/theme_service.cc
diff --git a/chrome/browser/themes/theme_service.cc b/chrome/browser/themes/theme_service.cc
index 709bedfde3841bb27e2b3f2b317da8f7ae05743a..c96f2df40724c8ae1258181b909ef6ac0a7f1136 100644
--- a/chrome/browser/themes/theme_service.cc
+++ b/chrome/browser/themes/theme_service.cc
@@ -334,10 +334,10 @@ void ThemeService::RemoveUnusedThemes(bool ignore_infobars) {
     return;
   std::string current_theme = GetThemeID();
   std::vector<std::string> remove_list;
-  scoped_ptr<const ExtensionSet> extensions(
+  scoped_ptr<const extensions::ExtensionSet> extensions(
       service->GenerateInstalledExtensionsSet());
   extensions::ExtensionPrefs* prefs = service->extension_prefs();
-  for (ExtensionSet::const_iterator it = extensions->begin();
+  for (extensions::ExtensionSet::const_iterator it = extensions->begin();
        it != extensions->end(); ++it) {
     const extensions::Extension* extension = *it;
     if (extension->is_theme() &&