Relanding the language detection.

chrome/common/notification_type.h

 // Copyright (c) 2009 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_COMMON_NOTIFICATION_TYPE_H_
 #define CHROME_COMMON_NOTIFICATION_TYPE_H_
 
 // This file describes various types used to describe and filter notifications
 // that pass through the NotificationService.
 //
@@ skipping 205 matching lines @@
 #endif
 
     // Indicates that a top window has been closed.  The source is the HWND
     // that was closed, no details are expected.
     WINDOW_CLOSED,
 
     // Sent when an info bubble has been created but not yet shown. The source
     // is the InfoBubble.
     INFO_BUBBLE_CREATED,
 
-    // Sent after a call to RenderViewHost::DeterminePageLanguage. The details
-    // are Details<std::string> and the source is Source<RenderViewHost>.
+    // Sent when the language (English, French...) for a page has been detected.
+    // The details Details<std::string> contain the ISO 639-1 language code and
+    // the source is Source<RenderViewHost>.
     TAB_LANGUAGE_DETERMINED,
 
     // Send after the code is run in specified tab.
     TAB_CODE_EXECUTED,
 
     // The user has changed the browser theme.
     BROWSER_THEME_CHANGED,
 
     // Sent when the renderer returns focus to the browser, as part of focus
     // traversal. The source is the browser, there are no details.
@@ skipping 573 matching lines @@
 };
 
 inline bool operator==(NotificationType::Type a, NotificationType b) {
   return a == b.value;
 }
 inline bool operator!=(NotificationType::Type a, NotificationType b) {
   return a != b.value;
 }
 
 #endif  // CHROME_COMMON_NOTIFICATION_TYPE_H_