Implement WebContentsModalDialogManagerDelegate for ShellWindow

chrome/browser/ui/cocoa/extensions/native_app_window_cocoa.h

Index: chrome/browser/ui/cocoa/extensions/native_app_window_cocoa.h
diff --git a/chrome/browser/ui/cocoa/extensions/native_app_window_cocoa.h b/chrome/browser/ui/cocoa/extensions/native_app_window_cocoa.h
index c957094ccb05402ad71056b8d62c362f55e9277d..e9f12a004c2e396f3e3f876fb16ae4dd12392fcf 100644
--- a/chrome/browser/ui/cocoa/extensions/native_app_window_cocoa.h
+++ b/chrome/browser/ui/cocoa/extensions/native_app_window_cocoa.h
@@ -113,6 +113,13 @@ class NativeAppWindowCocoa : public NativeAppWindow {
   virtual void RenderViewHostChanged() OVERRIDE;
   virtual gfx::Insets GetFrameInsets() const OVERRIDE;
 
+  // WebContentsModalDialogHost implementation.
+  virtual gfx::Point GetDialogPosition(const gfx::Size& size) OVERRIDE;
+  virtual void AddObserver(
+      WebContentsModalDialogHostObserver* observer) OVERRIDE;
+  virtual void RemoveObserver(
+      WebContentsModalDialogHostObserver* observer) OVERRIDE;
+
  private:
   virtual ~NativeAppWindowCocoa();