Drop all uses of //base except ObserverList from view mgr client lib

mojo/services/view_manager/public/cpp/view_observer.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_OBSERVER_H_
 #define MOJO_SERVICES_VIEW_MANAGER_PUBLIC_CPP_VIEW_OBSERVER_H_
 
 #include <vector>
 
-#include "base/basictypes.h"
-
 #include "input_events/public/interfaces/input_events.mojom.h"
 #include "view_manager/public/cpp/view.h"
 
 namespace mojo {
 
 class View;
 
 // A note on -ing and -ed suffixes:
 //
 // -ing methods are called before changes are applied to the local view model.
@@ skipping 77 matching lines @@
   virtual void OnViewDrawnChanging(View* view) {}
   virtual void OnViewDrawnChanged(View* view) {}
 
  protected:
   virtual ~ViewObserver() {}
 };
 
 }  // namespace mojo
 
 #endif  // MOJO_SERVICES_VIEW_MANAGER_PUBLIC_CPP_VIEW_OBSERVER_H_