Add an extension bubble explaining which extensions are in dev mode.

chrome/browser/extensions/extension_message_bubble.h

 // Copyright (c) 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 CHROME_BROWSER_EXTENSIONS_SUSPICIOUS_EXTENSION_BUBBLE_H_
-#define CHROME_BROWSER_EXTENSIONS_SUSPICIOUS_EXTENSION_BUBBLE_H_
+#ifndef CHROME_BROWSER_EXTENSIONS_EXTENSION_MESSAGE_BUBBLE_H_
+#define CHROME_BROWSER_EXTENSIONS_EXTENSION_MESSAGE_BUBBLE_H_
 
 #include "base/bind.h"
 
 class Browser;
 
 namespace extensions {
 
 // The interface between the SuspiciousExtensionBubble bubble and its
 // controller.
-class SuspiciousExtensionBubble {
+class ExtensionMessageBubble {
  public:
-  // Setup the callback for when the button is clicked in the bubble.
-  virtual void OnButtonClicked(const base::Closure& callback) = 0;
+  // Setup the callback for when the action button is clicked in the
+  // bubble.
+  virtual void OnActionButtonClicked(const base::Closure& callback) = 0;
+
+  // Setup the callback for when the dismiss button is clicked.
+  virtual void OnDismissButtonClicked(const base::Closure& callback) = 0;
+
   // Setup the callback for when the link is clicked in the bubble.
-  virtual void OnLinkClicked(const base::Closure&) = 0;
+  virtual void OnLinkClicked(const base::Closure& callback) = 0;
+
   // Instruct the bubble to appear.
   virtual void Show() = 0;
 };
 
 }  // namespace extensions
 
-#endif  // CHROME_BROWSER_EXTENSIONS_SUSPICIOUS_EXTENSION_BUBBLE_H_
+#endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_MESSAGE_BUBBLE_H_