Refactoring DownloadManager::DownloadURL to add proper annotation.

components/download/internal/test/test_download_driver.h

Index: components/download/internal/test/test_download_driver.h
diff --git a/components/download/internal/test/test_download_driver.h b/components/download/internal/test/test_download_driver.h
index 010777aa6f94936a1286e244fd49ad52d8cfe216..5e540f65eda92c66b81022fe1dd83ea22729d840 100644
--- a/components/download/internal/test/test_download_driver.h
+++ b/components/download/internal/test/test_download_driver.h
@@ -10,6 +10,7 @@
 
 #include "base/macros.h"
 #include "components/download/internal/download_driver.h"
+#include "net/traffic_annotation/network_traffic_annotation.h"
 
 namespace download {
 namespace test {
@@ -33,7 +34,9 @@ class TestDownloadDriver : public DownloadDriver {
   // DownloadDriver implementation.
   void Initialize(DownloadDriver::Client* client) override;
   bool IsReady() const override;
-  void Start(const DownloadParams& params) override;
+  void Start(
+      const DownloadParams& params,
+      const net::NetworkTrafficAnnotationTag& traffic_annotation) override;
   void Cancel(const std::string& guid) override;
   void Pause(const std::string& guid) override;
   void Resume(const std::string& guid) override;