Cleans up gyp file for views example and removes duplicate code

ui/views/examples/multiline_example.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.
 
 #ifndef UI_VIEWS_EXAMPLES_MULTILINE_EXAMPLE_H_
 #define UI_VIEWS_EXAMPLES_MULTILINE_EXAMPLE_H_
 
 #include "base/compiler_specific.h"
 #include "base/strings/string16.h"
 #include "ui/views/controls/button/checkbox.h"
 #include "ui/views/controls/textfield/textfield_controller.h"
 #include "ui/views/examples/example_base.h"
 
 namespace views {
 
 class Label;
 
 namespace examples {
 
 // An example that compares the multiline rendering of different controls.
-class MultilineExample : public ExampleBase,
-                         public TextfieldController,
-                         public ButtonListener {
+class VIEWS_EXAMPLES_EXPORT MultilineExample : public ExampleBase,
+                                               public TextfieldController,
+                                               public ButtonListener {
  public:
   MultilineExample();
   virtual ~MultilineExample();
 
   // ExampleBase:
   virtual void CreateExampleView(View* container) OVERRIDE;
 
   // ButtonListener:
   virtual void ButtonPressed(Button* sender, const ui::Event& event) OVERRIDE;
 
@@ skipping 13 matching lines @@
   // Checkbox to enable and disable text rendering in |label_|.
   Checkbox* label_checkbox_;
 
   DISALLOW_COPY_AND_ASSIGN(MultilineExample);
 };
 
 }  // namespace examples
 }  // namespace views
 
 #endif  // UI_VIEWS_EXAMPLES_MULTILINE_EXAMPLE_H_