Update from https://crrev.com/333737

mojo/services/view_manager/public/cpp/view.h

 // Copyright 2014 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.
 
 #ifndef MOJO_SERVICES_VIEW_MANAGER_PUBLIC_CPP_VIEW_H_
 #define MOJO_SERVICES_VIEW_MANAGER_PUBLIC_CPP_VIEW_H_
 
 #include <stdint.h>
 #include <vector>
 
@@ skipping 164 matching lines @@
 
   // Returns true if embed is allowed for this node. If embedding is allowed all
   // the children are removed.
   bool PrepareForEmbed();
 
   ViewManager* manager_;
   Id id_;
   View* parent_;
   Children children_;
 
-  ObserverList<ViewObserver> observers_;
+  base::ObserverList<ViewObserver> observers_;
 
   Rect bounds_;
   ViewportMetricsPtr viewport_metrics_;
 
   bool visible_;
 
   SharedProperties properties_;
 
   // Drawn state is derived from the visible state and the parent's visible
   // state. This field is only used if the view has no parent (eg it's a root).
   bool drawn_;
 
   // Value struct to keep the name and deallocator for this property.
   // Key cannot be used for this purpose because it can be char* or
   // WindowProperty<>.
   struct Value {
     const char* name;
     int64_t value;
     PropertyDeallocator deallocator;
   };
 
   std::map<const void*, Value> prop_map_;
 
   MOJO_DISALLOW_COPY_AND_ASSIGN(View);
 };
 
 }  // namespace mojo
 
 #endif  // MOJO_SERVICES_VIEW_MANAGER_PUBLIC_CPP_VIEW_H_