[Downloads] Add real observers to MockDownloadItem.

chrome/browser/download/all_download_item_notifier_unittest.cc

Index: chrome/browser/download/all_download_item_notifier_unittest.cc
diff --git a/chrome/browser/download/all_download_item_notifier_unittest.cc b/chrome/browser/download/all_download_item_notifier_unittest.cc
index 453feba75f799be7ceaeade10b032ec2e95b8f0b..99d0f58a858dd5dad2f54cdfea1e5261a1c74ec4 100644
--- a/chrome/browser/download/all_download_item_notifier_unittest.cc
+++ b/chrome/browser/download/all_download_item_notifier_unittest.cc
@@ -85,7 +85,6 @@ TEST_F(AllDownloadItemNotifierTest,
   items.push_back(&item());
   EXPECT_CALL(manager(), GetAllDownloads(_))
     .WillOnce(SetArgPointee<0>(items));
-  EXPECT_CALL(item(), AddObserver(_));
   SetNotifier();
 
   EXPECT_CALL(observer(), OnDownloadUpdated(&manager(), &item()));
@@ -97,7 +96,6 @@ TEST_F(AllDownloadItemNotifierTest,
   EXPECT_CALL(observer(), OnDownloadRemoved(&manager(), &item()));
   NotifierAsItemObserver()->OnDownloadRemoved(&item());
 
-  EXPECT_CALL(item(), RemoveObserver(NotifierAsItemObserver()));
   EXPECT_CALL(manager(), RemoveObserver(NotifierAsManagerObserver()));
   ClearNotifier();
 }
@@ -107,7 +105,6 @@ TEST_F(AllDownloadItemNotifierTest,
   EXPECT_CALL(manager(), GetAllDownloads(_));
   SetNotifier();
 
-  EXPECT_CALL(item(), AddObserver(NotifierAsItemObserver()));
   EXPECT_CALL(observer(), OnDownloadCreated(&manager(), &item()));
   NotifierAsManagerObserver()->OnDownloadCreated(
       &manager(), &item());
@@ -115,8 +112,5 @@ TEST_F(AllDownloadItemNotifierTest,
   EXPECT_CALL(manager(), RemoveObserver(NotifierAsManagerObserver()));
   NotifierAsManagerObserver()->ManagerGoingDown(&manager());
 
-  EXPECT_CALL(item(), RemoveObserver(NotifierAsItemObserver()));
-  NotifierAsItemObserver()->OnDownloadDestroyed(&item());
-
   ClearNotifier();
 }