Reduce usage of FOR_EACH_OBSERVER macro in content/

content/public/test/mock_download_item.cc

Index: content/public/test/mock_download_item.cc
diff --git a/content/public/test/mock_download_item.cc b/content/public/test/mock_download_item.cc
index 562972a2658e7f1d73d4d496f9e13d5cf4cd28bb..7b19c3195401c978600d92a8765c49f77202cafb 100644
--- a/content/public/test/mock_download_item.cc
+++ b/content/public/test/mock_download_item.cc
@@ -9,7 +9,8 @@ namespace content {
 MockDownloadItem::MockDownloadItem() {}
 
 MockDownloadItem::~MockDownloadItem() {
-  FOR_EACH_OBSERVER(Observer, observers_, OnDownloadDestroyed(this));
+  for (auto& observer : observers_)
+    observer.OnDownloadDestroyed(this);
 }
 
 void MockDownloadItem::AddObserver(Observer* observer) {
@@ -21,15 +22,18 @@ void MockDownloadItem::RemoveObserver(Observer* observer) {
 }
 
 void MockDownloadItem::NotifyObserversDownloadOpened() {
-  FOR_EACH_OBSERVER(Observer, observers_, OnDownloadOpened(this));
+  for (auto& observer : observers_)
+    observer.OnDownloadOpened(this);
 }
 
 void MockDownloadItem::NotifyObserversDownloadRemoved() {
-  FOR_EACH_OBSERVER(Observer, observers_, OnDownloadRemoved(this));
+  for (auto& observer : observers_)
+    observer.OnDownloadRemoved(this);
 }
 
 void MockDownloadItem::NotifyObserversDownloadUpdated() {
-  FOR_EACH_OBSERVER(Observer, observers_, OnDownloadUpdated(this));
+  for (auto& observer : observers_)
+    observer.OnDownloadUpdated(this);
 }
 
 }