Implement window.alert() and its cousins for extensions....

chrome/browser/views/jsmessage_box_dialog.h

 // Copyright (c) 2006-2008 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 CHROME_BROWSER_VIEWS_JSMESSAGE_BOX_DIALOG_H_
 #define CHROME_BROWSER_VIEWS_JSMESSAGE_BOX_DIALOG_H_
 
 #include <string>
 
 #include "chrome/browser/app_modal_dialog.h"
 #include "views/window/dialog_delegate.h"
 
 class MessageBoxView;
-class TabContents;
+class JavaScriptMessageBoxClient;
 namespace views {
 class Window;
 }
 
 class JavascriptMessageBoxDialog : public views::DialogDelegate {
  public:
   JavascriptMessageBoxDialog(AppModalDialog* parent,
                              const std::wstring& message_text,
                              const std::wstring& default_prompt_text,
                              bool display_suppress_checkbox);
@@ skipping 15 matching lines @@
   virtual std::wstring GetDialogButtonLabel(
       MessageBoxFlags::DialogButton button) const;
 
   // views::WindowDelegate Methods:
   virtual bool IsModal() const { return true; }
   virtual views::View* GetContentsView();
   virtual views::View* GetInitiallyFocusedView();
   virtual void OnClose();
 
  private:
-  TabContents* tab_contents() {
-    return parent_->tab_contents();
+  JavaScriptMessageBoxClient* client() {
+    return parent_->client();
   }
 
   // A pointer to the AppModalDialog that owns us.
   AppModalDialog* parent_;
 
   // The message box view whose commands we handle.
   MessageBoxView* message_box_view_;
 
   // The dialog if it is currently visible.
   views::Window* dialog_;
 
   DISALLOW_COPY_AND_ASSIGN(JavascriptMessageBoxDialog);
 };
 
 #endif  // CHROME_BROWSER_VIEWS_JSMESSAGE_BOX_DIALOG_H_