Oust BubbleWindow from ExtensionDialog, use chromeos::BubbleFrameView directly.

chrome/browser/ui/views/extensions/extension_dialog.h

Index: chrome/browser/ui/views/extensions/extension_dialog.h
diff --git a/chrome/browser/ui/views/extensions/extension_dialog.h b/chrome/browser/ui/views/extensions/extension_dialog.h
index e80f0a92746c3aa26f2958f7970e86164d72e8af..a39fb8b5d9e7d6accbdb0a346e3a92d2fbb6acfa 100644
--- a/chrome/browser/ui/views/extensions/extension_dialog.h
+++ b/chrome/browser/ui/views/extensions/extension_dialog.h
@@ -17,11 +17,6 @@ class ExtensionHost;
 class GURL;
 class TabContents;
 
-namespace views {
-class View;
-class Widget;
-}
-
 // Modal dialog containing contents provided by an extension.
 // Dialog is automatically centered in the browser window and has fixed size.
 // For example, used by the Chrome OS file browser.
@@ -64,6 +59,9 @@ class ExtensionDialog : public views::WidgetDelegate,
   virtual views::Widget* GetWidget() OVERRIDE;
   virtual const views::Widget* GetWidget() const OVERRIDE;
   virtual views::View* GetContentsView() OVERRIDE;
+#if defined(OS_CHROMEOS)
+  virtual views::NonClientFrameView* CreateNonClientFrameView() OVERRIDE;
+#endif
 
   // content::NotificationObserver overrides.
   virtual void Observe(int type,