Refactoring DownloadManager::DownloadURL to add proper annotation.

content/public/browser/download_manager.h

Index: content/public/browser/download_manager.h
diff --git a/content/public/browser/download_manager.h b/content/public/browser/download_manager.h
index f6080fe5df2fa375ec65a05787eac3c6a881163d..038195b894e1f7d762348b7f41c6090b72f15fb6 100644
--- a/content/public/browser/download_manager.h
+++ b/content/public/browser/download_manager.h
@@ -40,6 +40,7 @@
 #include "content/public/browser/download_item.h"
 #include "content/public/browser/download_url_parameters.h"
 #include "net/base/net_errors.h"
+#include "net/traffic_annotation/network_traffic_annotation.h"
 
 class GURL;
 
@@ -121,7 +122,8 @@ class CONTENT_EXPORT DownloadManager : public base::SupportsUserData::Data {
 
   // See DownloadUrlParameters for details about controlling the download.
   virtual void DownloadUrl(
-      std::unique_ptr<DownloadUrlParameters> parameters) = 0;
+      std::unique_ptr<DownloadUrlParameters> parameters,
+      const net::NetworkTrafficAnnotationTag& traffic_annotation) = 0;
 
   // Allow objects to observe the download creation process.
   virtual void AddObserver(Observer* observer) = 0;