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

content/browser/download/mock_download_file.cc

Index: content/browser/download/mock_download_file.cc
diff --git a/content/browser/download/mock_download_file.cc b/content/browser/download/mock_download_file.cc
index 36282d51b4dcb7c20a5f80cbaf6721661670067a..180ea1b9f9013592ef48f9880d46d59297660578 100644
--- a/content/browser/download/mock_download_file.cc
+++ b/content/browser/download/mock_download_file.cc
@@ -11,9 +11,11 @@ using ::testing::Return;
 namespace content {
 namespace {
 
-void SuccessRun(const DownloadFile::InitializeCallback& callback,
-                const DownloadItem::ReceivedSlices& received_slices) {
-  callback.Run(DOWNLOAD_INTERRUPT_REASON_NONE);
+void SuccessRun(
+    const DownloadFile::InitializeCallback& initialize_callback,
+    const DownloadFile::CancelRequestCallback& cancel_request_callback,
+    const DownloadItem::ReceivedSlices& received_slices) {
+  initialize_callback.Run(DOWNLOAD_INTERRUPT_REASON_NONE);
 }
 
 }  // namespace
@@ -21,7 +23,8 @@ void SuccessRun(const DownloadFile::InitializeCallback& callback,
 MockDownloadFile::MockDownloadFile() {
   // This is here because |Initialize()| is normally called right after
   // construction.
-  ON_CALL(*this, Initialize(_, _)).WillByDefault(::testing::Invoke(SuccessRun));
+  ON_CALL(*this, Initialize(_, _, _))
+      .WillByDefault(::testing::Invoke(SuccessRun));
 }
 
 MockDownloadFile::~MockDownloadFile() {