Refactoring DownloadManager::DownloadURL to add proper annotation.

content/public/test/mock_download_manager.h

Index: content/public/test/mock_download_manager.h
diff --git a/content/public/test/mock_download_manager.h b/content/public/test/mock_download_manager.h
index f462fa127e4f5ea8024f1eb5997d611a0f02602f..642aaa30667e161768966a1f9b20509360cb20a8 100644
--- a/content/public/test/mock_download_manager.h
+++ b/content/public/test/mock_download_manager.h
@@ -13,6 +13,7 @@
 #include "content/public/browser/download_manager.h"
 #include "content/public/browser/download_save_info.h"
 #include "content/public/browser/download_url_parameters.h"
+#include "net/traffic_annotation/network_traffic_annotation.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "url/gurl.h"
@@ -112,7 +113,9 @@ class MockDownloadManager : public DownloadManager {
                    base::Time remove_begin,
                    base::Time remove_end));
   MOCK_METHOD1(DownloadUrlMock, void(DownloadUrlParameters*));
-  void DownloadUrl(std::unique_ptr<DownloadUrlParameters> params) override {
+  void DownloadUrl(
+      std::unique_ptr<DownloadUrlParameters> params,
+      const net::NetworkTrafficAnnotationTag& traffic_annotation) override {
     DownloadUrlMock(params.get());
   }
   MOCK_METHOD1(AddObserver, void(Observer* observer));