Adds some debugging code in hopes of isolating bug 6316. I suspect the...

chrome/common/notification_type.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_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 511 matching lines @@
     USER_SCRIPTS_LOADED,
 
     // Extensions --------------------------------------------------------------
 
     // Sent when new extensions are loaded. The details are an ExtensionList*.
     EXTENSIONS_LOADED,
 
     // Sent when new extensions are installed. The details are a FilePath.
     EXTENSION_INSTALLED,
 
+    // Debugging ---------------------------------------------------------------
+
+    // Sent from ~RenderViewHost. The source is the RenderViewHost.
+    RENDER_VIEW_HOST_DELETED,
+
     // Count (must be last) ----------------------------------------------------
     // Used to determine the number of notification types.  Not valid as
     // a type parameter when registering for or posting notifications.
     NOTIFICATION_TYPE_COUNT
   };
 
   NotificationType(Type v) : value(v) {}
 
   bool operator==(NotificationType t) const { return value == t.value; }
   bool operator!=(NotificationType t) const { return value != t.value; }
 
   // Comparison to explicit enum values.
   bool operator==(Type v) const { return value == v; }
   bool operator!=(Type v) const { return value != v; }
 
   Type value;
 };
 
 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_