Add NOTIFICATION_EXTENSION_REMOVED for Extensions removed from ExtensionService.

chrome/browser/extensions/extension_service.cc

Index: chrome/browser/extensions/extension_service.cc
diff --git a/chrome/browser/extensions/extension_service.cc b/chrome/browser/extensions/extension_service.cc
index 42cb3fa69ea9ea451229871e5df976d830fb9cd7..f7fd9ca960cc427d9c23152b6dcf080f7db61f9f 100644
--- a/chrome/browser/extensions/extension_service.cc
+++ b/chrome/browser/extensions/extension_service.cc
@@ -921,6 +921,8 @@ void ExtensionService::EnableExtension(const std::string& 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);
 
@@ -1880,6 +1882,8 @@ void ExtensionService::UnloadExtension(
     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_),
@@ -3118,3 +3122,13 @@ 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);
+}