Added DownloadProcessHandle class.

chrome/browser/download/download_file.h

Index: chrome/browser/download/download_file.h
diff --git a/chrome/browser/download/download_file.h b/chrome/browser/download/download_file.h
index 815f643bc36d85c0c6a78655c420517f2662c380..63060fec55c600f89de77d2faaeafd89eb93fe47 100644
--- a/chrome/browser/download/download_file.h
+++ b/chrome/browser/download/download_file.h
@@ -11,6 +11,7 @@
 #include "base/basictypes.h"
 #include "base/memory/ref_counted.h"
 #include "chrome/browser/download/base_file.h"
+#include "chrome/browser/download/download_process_handle.h"
 #include "chrome/browser/download/download_types.h"
 
 struct DownloadCreateInfo;
@@ -40,11 +41,9 @@ class DownloadFile : public BaseFile {
   // the DownloadFileManager for its internal record keeping.
   int id_;
 
-  // IDs for looking up the tab we are associated with.
-  int child_id_;
-
-  // Handle for informing the ResourceDispatcherHost of a UI based cancel.
-  int request_id_;
+  // The handle to the process information.  Used for operations outside the
+  // download system, specifically canceling a download.
+  DownloadProcessHandle process_handle_;
 
   // DownloadManager this download belongs to.
   scoped_refptr<DownloadManager> download_manager_;