Change DownloadProcessHandle to be more of an encapsulated class.

chrome/browser/download/download_util.h

Index: chrome/browser/download/download_util.h
diff --git a/chrome/browser/download/download_util.h b/chrome/browser/download/download_util.h
index e7726a9d28ac646f4aa640c022bee14a006139b2..c279973a768eecd21a2a755a128d63c7499afb88 100644
--- a/chrome/browser/download/download_util.h
+++ b/chrome/browser/download/download_util.h
@@ -14,7 +14,6 @@
 #include "base/file_path.h"
 #include "base/memory/ref_counted.h"
 #include "base/string16.h"
-#include "chrome/browser/download/download_process_handle.h"
 #include "ui/gfx/native_widget_types.h"
 
 #if defined(TOOLKIT_VIEWS)
@@ -269,13 +268,6 @@ void DownloadUrl(const GURL& url,
                  int render_view_id,
                  const content::ResourceContext* context);
 
-// Tells the resource dispatcher host to cancel a download request.
-// Must be called on the IO thread.
-// |process_handle| is passed by value because it is ultimately passed to
-// other threads, and this way we don't have to worry about object lifetimes.
-void CancelDownloadRequest(ResourceDispatcherHost* rdh,
-                           DownloadProcessHandle process_handle);
-
 // Sends a notification on downloads being initiated
 // Must be called on the UI thread.
 void NotifyDownloadInitiated(int render_process_id, int render_view_id);