Refactoring DownloadManager::DownloadURL to add proper annotation.

content/browser/download/download_manager_impl.h

Index: content/browser/download/download_manager_impl.h
diff --git a/content/browser/download/download_manager_impl.h b/content/browser/download/download_manager_impl.h
index e9b13f69e708a22abc1f86778cd196f87f1b606b..23e6ba70cfe2a56d60537ae06f63b3094c8d9eca 100644
--- a/content/browser/download/download_manager_impl.h
+++ b/content/browser/download/download_manager_impl.h
@@ -27,6 +27,7 @@
 #include "content/public/browser/download_manager.h"
 #include "content/public/browser/download_manager_delegate.h"
 #include "content/public/browser/download_url_parameters.h"
+#include "net/traffic_annotation/network_traffic_annotation.h"
 
 namespace net {
 class NetLog;
@@ -79,7 +80,9 @@ class CONTENT_EXPORT DownloadManagerImpl : public DownloadManager,
       const base::Callback<bool(const GURL&)>& url_filter,
       base::Time remove_begin,
       base::Time remove_end) override;
-  void DownloadUrl(std::unique_ptr<DownloadUrlParameters> params) override;
+  void DownloadUrl(
+      std::unique_ptr<DownloadUrlParameters> params,
+      const net::NetworkTrafficAnnotationTag& traffic_annotation) override;
   void AddObserver(Observer* observer) override;
   void RemoveObserver(Observer* observer) override;
   content::DownloadItem* CreateDownloadItem(