Made the cancel from CancelDownloadOnRename go through the full cancel path,

content/browser/download/download_item.cc

Index: content/browser/download/download_item.cc
diff --git a/content/browser/download/download_item.cc b/content/browser/download/download_item.cc
index 27fa466f413ff6f5f50f318b1109d4451a6c52f4..e881f0fe7b556431d9d38a1aeb5925bd11a8f4ec 100644
--- a/content/browser/download/download_item.cc
+++ b/content/browser/download/download_item.cc
@@ -367,7 +367,7 @@ void DownloadItem::Cancel(bool update_history) {
   TransitionTo(CANCELLED);
   StopProgressTimer();
   if (update_history)
-    download_manager_->DownloadCancelled(download_id_);
+    download_manager_->DownloadCancelledInternal(this);
 }
 
 void DownloadItem::MarkAsComplete() {
@@ -703,6 +703,16 @@ FilePath DownloadItem::GetUserVerifiedFilePath() const {
       GetTargetFilePath() : full_path_;
 }
 
+void DownloadItem::OffThreadCancel(DownloadFileManager* file_manager) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+  request_handle_.CancelRequest();
+
+  BrowserThread::PostTask(
+      BrowserThread::FILE, FROM_HERE,
+      NewRunnableMethod(
+          file_manager, &DownloadFileManager::CancelDownload, download_id_));
+}
+
 void DownloadItem::Init(bool active) {
   // TODO(rdsmith): Change to DCHECK after http://crbug.com/85408 resolved.
   CHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));