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

content/public/test/test_file_error_injector.cc

Index: content/public/test/test_file_error_injector.cc
diff --git a/content/public/test/test_file_error_injector.cc b/content/public/test/test_file_error_injector.cc
index 867d1a00d3cff345101ed4bc288c190c9f9a4eb6..b635121876011f0cd3a2cd3a8257e850ddda519d 100644
--- a/content/public/test/test_file_error_injector.cc
+++ b/content/public/test/test_file_error_injector.cc
@@ -42,7 +42,8 @@ class DownloadFileWithError: public DownloadFileImpl {
 
   ~DownloadFileWithError() override;
 
-  void Initialize(const InitializeCallback& callback,
+  void Initialize(const InitializeCallback& initialize_callback,
+                  const CancelRequestCallback& cancel_request_callback,
                   const DownloadItem::ReceivedSlices& received_slices) override;
 
   // DownloadFile interface.
@@ -133,10 +134,11 @@ DownloadFileWithError::~DownloadFileWithError() {
 }
 
 void DownloadFileWithError::Initialize(
-    const InitializeCallback& callback,
+    const InitializeCallback& initialize_callback,
+    const CancelRequestCallback& cancel_request_callback,
     const DownloadItem::ReceivedSlices& received_slices) {
   DownloadInterruptReason error_to_return = DOWNLOAD_INTERRUPT_REASON_NONE;
-  InitializeCallback callback_to_use = callback;
+  InitializeCallback callback_to_use = initialize_callback;
 
   // Replace callback if the error needs to be overwritten.
   if (OverwriteError(
@@ -145,18 +147,18 @@ void DownloadFileWithError::Initialize(
     if (DOWNLOAD_INTERRUPT_REASON_NONE != error_to_return) {
       // Don't execute a, probably successful, Initialize; just
       // return the error.
-      BrowserThread::PostTask(
-          BrowserThread::UI, FROM_HERE, base::Bind(
-              callback, error_to_return));
+      BrowserThread::PostTask(BrowserThread::UI, FROM_HERE,
+                              base::Bind(initialize_callback, error_to_return));
       return;
     }
 
     // Otherwise, just wrap the return.
-    callback_to_use = base::Bind(&InitializeErrorCallback, callback,
+    callback_to_use = base::Bind(&InitializeErrorCallback, initialize_callback,
                                  error_to_return);
   }
 
-  DownloadFileImpl::Initialize(callback_to_use, received_slices);
+  DownloadFileImpl::Initialize(callback_to_use, cancel_request_callback,
+                               received_slices);
 }
 
 DownloadInterruptReason DownloadFileWithError::WriteDataToFile(