Add a new GetInstance() method for singleton classes, take 2.

ceee/ie/plugin/bho/webrequest_notifier.h

 // Copyright (c) 2010 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.
 //
 // Web request notifier implementation.
 #ifndef CEEE_IE_PLUGIN_BHO_WEBREQUEST_NOTIFIER_H_
 #define CEEE_IE_PLUGIN_BHO_WEBREQUEST_NOTIFIER_H_
 
 #include <atlbase.h>
 #include <wininet.h>
@@ skipping 425 matching lines @@
     // Initialization has succeeded.
     SUCCEEDED_TO_INITIALIZE
   };
   InitializeState initialize_state_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(WebRequestNotifier);
 };
 
 // A singleton that keeps the WebRequestNotifier used by production code.
-class ProductionWebRequestNotifier
-    : public WebRequestNotifier,
-      public Singleton<ProductionWebRequestNotifier> {
+class ProductionWebRequestNotifier : public WebRequestNotifier {
+ public:
+  static ProductionWebRequestNotifier* GetInstance();
+
  private:
   ProductionWebRequestNotifier() {}
 
   friend struct DefaultSingletonTraits<ProductionWebRequestNotifier>;
   DISALLOW_COPY_AND_ASSIGN(ProductionWebRequestNotifier);
 };
 
 #endif  // CEEE_IE_PLUGIN_BHO_WEBREQUEST_NOTIFIER_H_