Moved the AppNotification system into extensions namespace

chrome/browser/extensions/app_notification_manager_unittest.cc

Index: chrome/browser/extensions/app_notification_manager_unittest.cc
diff --git a/chrome/browser/extensions/app_notification_manager_unittest.cc b/chrome/browser/extensions/app_notification_manager_unittest.cc
index 329e47f6cb7b437e309ab0ab1325d21db228b6c0..27c1ebf33b06dea0e076f0901f8686e1889b4fbb 100644
--- a/chrome/browser/extensions/app_notification_manager_unittest.cc
+++ b/chrome/browser/extensions/app_notification_manager_unittest.cc
@@ -18,10 +18,11 @@
 #include "testing/gtest/include/gtest/gtest.h"
 
 using content::BrowserThread;
-using extensions::Extension;
 
 namespace util = app_notification_test_util;
 
+namespace extensions {
+
 class AppNotificationManagerTest : public testing::Test {
  public:
   AppNotificationManagerTest()
@@ -127,3 +128,5 @@ TEST_F(AppNotificationManagerTest, ExtensionUninstall) {
   EXPECT_EQ(NULL, mgr_->GetAll(id1));
   util::ExpectListsEqual(list2, *mgr_->GetAll(id2));
 }
+
+}  // namespace extensions