Revert of Update first download notification correctly if there are multiple notifications

chrome/browser/download/notification/download_item_notification_unittest.cc

Index: chrome/browser/download/notification/download_item_notification_unittest.cc
diff --git a/chrome/browser/download/notification/download_item_notification_unittest.cc b/chrome/browser/download/notification/download_item_notification_unittest.cc
index 30a497b0e52eaeafa06f51ac066e66b3c85ece9e..52c885a2f79cf125015d45e8a322af5e2707e1ef 100644
--- a/chrome/browser/download/notification/download_item_notification_unittest.cc
+++ b/chrome/browser/download/notification/download_item_notification_unittest.cc
@@ -35,26 +35,6 @@
 
 namespace test {
 
-class MockMessageCenter : public message_center::FakeMessageCenter {
- public:
-  MockMessageCenter() {}
-  ~MockMessageCenter() override {}
-
-  void AddVisibleNotification(message_center::Notification* notification) {
-    visible_notifications_.insert(notification);
-  }
-
-  const message_center::NotificationList::Notifications&
-      GetVisibleNotifications() override {
-    return visible_notifications_;
-  }
-
- private:
-  message_center::NotificationList::Notifications visible_notifications_;
-
-  DISALLOW_COPY_AND_ASSIGN(MockMessageCenter);
-};
-
 class DownloadItemNotificationTest : public testing::Test {
  public:
   DownloadItemNotificationTest()
@@ -76,10 +56,6 @@
 
     download_notification_manager_.reset(
         new DownloadNotificationManagerForProfile(profile_, nullptr));
-
-    message_center_.reset(new MockMessageCenter());
-    download_notification_manager_->OverrideMessageCenterForTest(
-        message_center_.get());
 
     base::FilePath download_item_target_path(kDownloadItemTargetPathString);
     download_item_.reset(new NiceMock<content::MockDownloadItem>());
@@ -159,8 +135,6 @@
     download_notification_manager_->OnNewDownloadReady(download_item_.get());
     download_item_notification_ =
         download_notification_manager_->items_[download_item_.get()];
-    message_center_->AddVisibleNotification(
-        download_item_notification_->notification_.get());
   }
 
   base::MessageLoopForUI message_loop_;
@@ -172,7 +146,6 @@
   scoped_ptr<NiceMock<content::MockDownloadItem>> download_item_;
   scoped_ptr<DownloadNotificationManagerForProfile>
       download_notification_manager_;
-  scoped_ptr<MockMessageCenter> message_center_;
   DownloadItemNotification* download_item_notification_;
 };