Fix an issue that we didn't clean url request properly.

content/browser/download/download_browsertest.cc

Index: content/browser/download/download_browsertest.cc
diff --git a/content/browser/download/download_browsertest.cc b/content/browser/download/download_browsertest.cc
index 38ad2db686ab49f286c0b6e78b3aedbf7695cb2b..be7caf0690fee98638ecdc568ab2766567999217 100644
--- a/content/browser/download/download_browsertest.cc
+++ b/content/browser/download/download_browsertest.cc
@@ -323,10 +323,12 @@ class CountingDownloadFile : public DownloadFileImpl {
 
   void Initialize(
       const InitializeCallback& callback,
+      const CancelRequestCallback& cancel_request_callback,
       const DownloadItem::ReceivedSlices& received_slices) override {
     DCHECK_CURRENTLY_ON(BrowserThread::FILE);
     active_files_++;
-    DownloadFileImpl::Initialize(callback, received_slices);
+    DownloadFileImpl::Initialize(callback, cancel_request_callback,
+                                 received_slices);
   }
 
   static void GetNumberActiveFiles(int* result) {