Add NOTIFICATION_EXTENSION_REMOVED for Extensions removed from ExtensionService.

chrome/browser/extensions/extension_service.cc

 // 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.
 
 #include "chrome/browser/extensions/extension_service.h"
 
 #include <algorithm>
 #include <iterator>
 #include <set>
 
@@ skipping 903 matching lines @@
   if (IsUnacknowledgedExternalExtension(extension)) {
     UMA_HISTOGRAM_ENUMERATION("Extensions.ExternalExtensionEvent",
                               EXTERNAL_EXTENSION_REENABLED,
                               EXTERNAL_EXTENSION_BUCKET_BOUNDARY);
     AcknowledgeExternalExtension(extension->id());
   }
 
   // Move it over to the enabled list.
   extensions_.Insert(make_scoped_refptr(extension));
   disabled_extensions_.Remove(extension->id());
+  FOR_EACH_OBSERVER(DisabledExtensionObserver, disabled_extension_observers_,
+                    OnDisabledExtensionRemoved(extension, true));
 
   NotifyExtensionLoaded(extension);
 
   // Notify listeners that the extension was enabled.
   content::NotificationService::current()->Notify(
       chrome::NOTIFICATION_EXTENSION_ENABLED,
       content::Source<Profile>(profile_),
       content::Details<const Extension>(extension));
 
   SyncExtensionChangeIfNeeded(*extension);
@@ skipping 939 matching lines @@
   // Clean up if the extension is meant to be enabled after a reload.
   reloading_extensions_.erase(extension->id());
 
   // Clean up runtime data.
   extension_runtime_data_.erase(extension_id);
 
   if (disabled_extensions_.Contains(extension->id())) {
     UnloadedExtensionInfo details(extension.get(), reason);
     details.already_disabled = true;
     disabled_extensions_.Remove(extension->id());
+    FOR_EACH_OBSERVER(DisabledExtensionObserver, disabled_extension_observers_,
+                      OnDisabledExtensionRemoved(extension.get(), false));
     content::NotificationService::current()->Notify(
         chrome::NOTIFICATION_EXTENSION_UNLOADED,
         content::Source<Profile>(profile_),
         content::Details<UnloadedExtensionInfo>(&details));
     // Make sure the profile cleans up its RequestContexts when an already
     // disabled extension is unloaded (since they are also tracking the disabled
     // extensions).
     system_->UnregisterExtensionWithRequestContexts(extension_id, reason);
     return;
   }
@@ skipping 1218 matching lines @@
 }
 
 void ExtensionService::AddUpdateObserver(extensions::UpdateObserver* observer) {
   update_observers_.AddObserver(observer);
 }
 
 void ExtensionService::RemoveUpdateObserver(
     extensions::UpdateObserver* observer) {
   update_observers_.RemoveObserver(observer);
 }
+
+void ExtensionService::AddDisabledExtensionObserver(
+    ExtensionService::DisabledExtensionObserver* observer) {
+  disabled_extension_observers_.AddObserver(observer);
+}
+
+void ExtensionService::RemoveDisabledExtensionObserver(
+    ExtensionService::DisabledExtensionObserver* observer) {
+  disabled_extension_observers_.RemoveObserver(observer);
+}