Use ExtensionRegistryObserver instead of deprecated extension notification from autocomplete

chrome/browser/autocomplete/extension_app_provider_unittest.cc

Index: chrome/browser/autocomplete/extension_app_provider_unittest.cc
diff --git a/chrome/browser/autocomplete/extension_app_provider_unittest.cc b/chrome/browser/autocomplete/extension_app_provider_unittest.cc
index 0ac201aca120570dcd129d83764b7041fd9d2474..f75c56d383b0d9b26a070aac5c9e602ca7cf02ce 100644
--- a/chrome/browser/autocomplete/extension_app_provider_unittest.cc
+++ b/chrome/browser/autocomplete/extension_app_provider_unittest.cc
@@ -26,7 +26,9 @@ class ExtensionAppProviderTest : public testing::Test {
 
   ExtensionAppProviderTest()
       : ui_thread_(content::BrowserThread::UI, &message_loop_),
-        history_service_(NULL) { }
+        profile_(new TestingProfile),
+        app_provider_(new ExtensionAppProvider(NULL, profile_.get())),
+        history_service_(NULL) {}
   virtual ~ExtensionAppProviderTest() { }
 
   virtual void SetUp() OVERRIDE;
@@ -37,21 +39,18 @@ class ExtensionAppProviderTest : public testing::Test {
  protected:
   base::MessageLoopForUI message_loop_;
   content::TestBrowserThread ui_thread_;
-  scoped_refptr<ExtensionAppProvider> app_provider_;
   scoped_ptr<TestingProfile> profile_;
+  scoped_refptr<ExtensionAppProvider> app_provider_;
   HistoryService* history_service_;
 };
 
 void ExtensionAppProviderTest::SetUp() {
-  profile_.reset(new TestingProfile());
   ASSERT_TRUE(profile_->CreateHistoryService(true, false));
   profile_->BlockUntilHistoryProcessesPendingRequests();
   history_service_ =
       HistoryServiceFactory::GetForProfile(profile_.get(),
                                            Profile::EXPLICIT_ACCESS);
 
-  app_provider_ = new ExtensionAppProvider(NULL, profile_.get());
-
   struct TestExtensionApp {
     const char* app_name;
     const char* launch_url;