Require explicit selection of traits for LazyInstance

content/public/renderer/render_frame_observer_tracker.h

 // 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.
 
 // Helper class used to find the RenderFrameObservers for a given RenderFrame.
 //
 // Example usage:
 //
 //   class MyRFO : public RenderFrameObserver,
 //                 public RenderFrameObserverTracker<MyRFO> {
@@ skipping 35 matching lines @@
       : render_frame_(render_frame) {
     render_frame_map_.Get()[render_frame] = this;
   }
   ~RenderFrameObserverTracker() {
     render_frame_map_.Get().erase(render_frame_);
   }
 
  private:
   const RenderFrame* render_frame_;
 
-  static base::LazyInstance<
-      std::map<const RenderFrame*, RenderFrameObserverTracker<T>*>>
-      render_frame_map_;
+  static typename base::LazyInstance<
+      std::map<const RenderFrame*, RenderFrameObserverTracker<T>*>>::
+      DestructorAtExit render_frame_map_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderFrameObserverTracker<T>);
 };
 
 template <class T>
-base::LazyInstance<std::map<const RenderFrame*,
-                            RenderFrameObserverTracker<T>*>>
-    RenderFrameObserverTracker<T>::render_frame_map_ =
+typename base::LazyInstance<
+    std::map<const RenderFrame*, RenderFrameObserverTracker<T>*>>::
+    DestructorAtExit RenderFrameObserverTracker<T>::render_frame_map_ =
         LAZY_INSTANCE_INITIALIZER;
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_RENDERER_RENDER_FRAME_OBSERVER_TRACKER_H_