Cleanup: Remove NOTIFICATION_EXTENSION_UNLOADED usage in MediaScanManager.

extensions/browser/extension_registry_unittest.cc

Index: extensions/browser/extension_registry_unittest.cc
===================================================================
--- extensions/browser/extension_registry_unittest.cc	(revision 259942)
+++ extensions/browser/extension_registry_unittest.cc	(working copy)
@@ -56,7 +56,7 @@
 };
 
 TEST_F(ExtensionRegistryTest, FillAndClearRegistry) {
-  ExtensionRegistry registry;
+  ExtensionRegistry registry(NULL);
   scoped_refptr<Extension> extension1 = test_util::CreateExtensionWithID("id1");
   scoped_refptr<Extension> extension2 = test_util::CreateExtensionWithID("id2");
   scoped_refptr<Extension> extension3 = test_util::CreateExtensionWithID("id3");
@@ -90,7 +90,7 @@
 
 // A simple test of adding and removing things from sets.
 TEST_F(ExtensionRegistryTest, AddAndRemoveExtensionFromRegistry) {
-  ExtensionRegistry registry;
+  ExtensionRegistry registry(NULL);
 
   // Adding an extension works.
   scoped_refptr<Extension> extension = test_util::CreateExtensionWithID("id");
@@ -111,7 +111,7 @@
 }
 
 TEST_F(ExtensionRegistryTest, AddExtensionToRegistryTwice) {
-  ExtensionRegistry registry;
+  ExtensionRegistry registry(NULL);
   scoped_refptr<Extension> extension = test_util::CreateExtensionWithID("id");
 
   // An extension can exist in two sets at once. It would be nice to eliminate
@@ -126,7 +126,7 @@
 }
 
 TEST_F(ExtensionRegistryTest, GetExtensionById) {
-  ExtensionRegistry registry;
+  ExtensionRegistry registry(NULL);
 
   // Trying to get an extension fails cleanly when the sets are empty.
   EXPECT_FALSE(
@@ -205,7 +205,7 @@
 }
 
 TEST_F(ExtensionRegistryTest, Observer) {
-  ExtensionRegistry registry;
+  ExtensionRegistry registry(NULL);
   TestObserver observer;
   registry.AddObserver(&observer);