Do all OOLing in the views code. linux_views now builds clean with the clang plugin.

views/controls/message_box_view.h

Index: views/controls/message_box_view.h
diff --git a/views/controls/message_box_view.h b/views/controls/message_box_view.h
index 7d1b5b024dd3d059616993e383ac291b9de3c2ae..811ad29d3a19055ca2ace84310e3351ee2709e15 100644
--- a/views/controls/message_box_view.h
+++ b/views/controls/message_box_view.h
@@ -32,6 +32,8 @@ class MessageBoxView : public views::View {
                  const std::wstring& message,
                  const std::wstring& default_prompt);
 
+  virtual ~MessageBoxView();
+
   // Returns the text box.
   views::Textfield* text_box() { return prompt_field_; }