Change DownloadProcessHandle to be more of an encapsulated class.

chrome/browser/download/download_file_manager.h

Index: chrome/browser/download/download_file_manager.h
diff --git a/chrome/browser/download/download_file_manager.h b/chrome/browser/download/download_file_manager.h
index 6047aeec9c39f0139f773a923540e6318b93921e..2b52636c03d3866a0f412d05eb6f49aaedd3fcd7 100644
--- a/chrome/browser/download/download_file_manager.h
+++ b/chrome/browser/download/download_file_manager.h
@@ -47,7 +47,7 @@
 #include "base/hash_tables.h"
 #include "base/memory/ref_counted.h"
 #include "base/timer.h"
-#include "chrome/browser/download/download_process_handle.h"
+#include "chrome/browser/download/download_request_handle.h"
 #include "ui/gfx/native_widget_types.h"
 
 struct DownloadBuffer;
@@ -142,12 +142,6 @@ class DownloadFileManager
                           DownloadManager* download_manager,
                           bool hash_needed);
 
-  // Tells the ResourceDispatcherHost to resume a download request
-  // that was paused to wait for the on-disk file to be created.
-  // |process| is passed by value because this is called from other
-  // threads, and this way we don't have to worry about object lifetimes.
-  void ResumeDownloadRequest(DownloadProcessHandle process);
-
   // Called only on the download thread.
   DownloadFile* GetDownloadFile(int id);