Replace the DownloadFileManager with direct ownership

content/public/browser/download_item.h

Index: content/public/browser/download_item.h
diff --git a/content/public/browser/download_item.h b/content/public/browser/download_item.h
index f1f420bc87481197d5a03a3bdb08d7328e3a02fa..b95a0c29f86d363e1446e224457c66945db2db20 100644
--- a/content/public/browser/download_item.h
+++ b/content/public/browser/download_item.h
@@ -27,7 +27,6 @@
 #include "content/public/browser/download_interrupt_reasons.h"
 #include "content/public/common/page_transition_types.h"
 
-class DownloadFileManager;
 class FilePath;
 class GURL;
 struct DownloadCreateInfo;
@@ -243,8 +242,7 @@ class CONTENT_EXPORT DownloadItem {
   // true.
   virtual void OnContentCheckCompleted(DownloadDangerType danger_type) = 0;
 
-  virtual void OnIntermediatePathDetermined(DownloadFileManager* file_manager,
-                                            const FilePath& path) = 0;
+  virtual void OnIntermediatePathDetermined(const FilePath& path) = 0;
 
   virtual bool IsPersisted() const = 0;