Added DownloadProcessHandle class.

chrome/browser/download/download_util.cc

Index: chrome/browser/download/download_util.cc
diff --git a/chrome/browser/download/download_util.cc b/chrome/browser/download/download_util.cc
index 720d03ada869e36bdb2244d3985127b9072779e4..6652490969e3cdccec6c5f55cc1926ab0f60363a 100644
--- a/chrome/browser/download/download_util.cc
+++ b/chrome/browser/download/download_util.cc
@@ -814,13 +814,24 @@ void DownloadUrl(
                      context);
 }
 
-void CancelDownloadRequest(ResourceDispatcherHost* rdh,
-                           int render_process_id,
-                           int request_id) {
+static void CancelDownloadRequestOnIOThread(
+    ResourceDispatcherHost* rdh, DownloadProcessHandle process_handle) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
   // |rdh| may be NULL in unit tests.
-  if (rdh)
-    rdh->CancelRequest(render_process_id, request_id, false);
+  if (!rdh)
+    return;
+
+  rdh->CancelRequest(process_handle.child_id(),
+                     process_handle.request_id(),
+                     false);
+}
+
+void CancelDownloadRequest(ResourceDispatcherHost* rdh,
+                           DownloadProcessHandle process_handle) {
+  BrowserThread::PostTask(
+      BrowserThread::IO, FROM_HERE,
+      NewRunnableFunction(&download_util::CancelDownloadRequestOnIOThread,
+                          rdh, process_handle));
 }
 
 void NotifyDownloadInitiated(int render_process_id, int render_view_id) {