Access singletons with a new GetInstance() method instead of Singleton<T>.

chrome/common/extensions/extension_message_bundle.h

Index: chrome/common/extensions/extension_message_bundle.h
diff --git a/chrome/common/extensions/extension_message_bundle.h b/chrome/common/extensions/extension_message_bundle.h
index 637055981ae7e640d906a65431379d1a2fde092a..df3bf350610f8677a0e8f8a78e9e01d8f690042c 100644
--- a/chrome/common/extensions/extension_message_bundle.h
+++ b/chrome/common/extensions/extension_message_bundle.h
@@ -155,15 +155,6 @@ typedef std::map<std::string, std::string> L10nMessagesMap;
 // A map of extension ID to l10n message map.
 typedef std::map<std::string, L10nMessagesMap > ExtensionToL10nMessagesMap;
 
-// Unique class for Singleton.
-struct ExtensionToMessagesMap {
-  ExtensionToMessagesMap();
-  ~ExtensionToMessagesMap();
-
-  // Maps extension ID to message map.
-  ExtensionToL10nMessagesMap messages_map;
-};
-
 // Returns the extension_id to messages map.
 ExtensionToL10nMessagesMap* GetExtensionToL10nMessagesMap();