Require explicit selection of traits for LazyInstance

content/public/renderer/render_view_observer_tracker.h

 // 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.
 
 // Helper class used to find the RenderViewObservers for a given RenderView.
 //
 // Example usage:
 //
 //   class MyRVO : public RenderViewObserver,
 //                 public RenderViewObserverTracker<MyRVO> {
@@ skipping 35 matching lines @@
       : render_view_(render_view) {
     render_view_map_.Get()[render_view] = this;
   }
   ~RenderViewObserverTracker() {
     render_view_map_.Get().erase(render_view_);
   }
 
  private:
   const RenderView* render_view_;
 
-  static base::LazyInstance<
-      std::map<const RenderView*, RenderViewObserverTracker<T>*>>
-      render_view_map_;
+  static typename base::LazyInstance<
+      std::map<const RenderView*, RenderViewObserverTracker<T>*>>::
+      DestructorAtExit render_view_map_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderViewObserverTracker<T>);
 };
 
 template <class T>
-base::LazyInstance<std::map<const RenderView*, RenderViewObserverTracker<T>*>>
-    RenderViewObserverTracker<T>::render_view_map_ = LAZY_INSTANCE_INITIALIZER;
+typename base::LazyInstance<
+    std::map<const RenderView*, RenderViewObserverTracker<T>*>>::
+    DestructorAtExit RenderViewObserverTracker<T>::render_view_map_ =
+        LAZY_INSTANCE_INITIALIZER;
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_RENDERER_RENDER_VIEW_OBSERVER_TRACKER_H_