Cleans up gyp file for views example and removes duplicate code

ui/views/examples/example_base.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.
 
 #ifndef UI_VIEWS_EXAMPLES_EXAMPLE_BASE_H_
 #define UI_VIEWS_EXAMPLES_EXAMPLE_BASE_H_
 
 #include <string>
 
 #include "base/basictypes.h"
+#include "ui/views/examples/views_examples_export.h"
 
 namespace views {
 class View;
 
 namespace examples {
 
-class ExampleBase {
+class VIEWS_EXAMPLES_EXPORT ExampleBase {
  public:
   virtual ~ExampleBase();
 
   // Sub-classes should creates and add the views to the given parent.
   virtual void CreateExampleView(View* parent) = 0;
 
   const std::string& example_title() const { return example_title_; }
   View* example_view() { return container_; }
 
  protected:
@@ skipping 16 matching lines @@
   // The view that contains the views example.
   View* container_;
 
   DISALLOW_COPY_AND_ASSIGN(ExampleBase);
 };
 
 }  // namespace examples
 }  // namespace views
 
 #endif  // UI_VIEWS_EXAMPLES_EXAMPLE_BASE_H_