Hooked up NetLog to DownloadItem, DownloadFile, and FileStream.

content/browser/download/download_manager_impl.h

Index: content/browser/download/download_manager_impl.h
diff --git a/content/browser/download/download_manager_impl.h b/content/browser/download/download_manager_impl.h
index ce28cc8eb14924dc17f5490073c5e8821079c138..bc9a8800cf3b1cfe21be5e7af41bf8e1beb0094d 100644
--- a/content/browser/download/download_manager_impl.h
+++ b/content/browser/download/download_manager_impl.h
@@ -25,7 +25,8 @@ class CONTENT_EXPORT DownloadManagerImpl
     : public content::DownloadManager,
       public DownloadItemImpl::Delegate {
  public:
-  DownloadManagerImpl(content::DownloadManagerDelegate* delegate);
+  DownloadManagerImpl(content::DownloadManagerDelegate* delegate,
+                      net::NetLog* net_log);
 
   // content::DownloadManager functions.
   virtual void Shutdown() OVERRIDE;
@@ -180,6 +181,8 @@ class CONTENT_EXPORT DownloadManagerImpl
   // Called when Save Page As entry is committed to the persistent store.
   void OnSavePageItemAddedToPersistentStore(int32 download_id, int64 db_handle);
 
+  virtual net::NetLog* GetNetLog();
+
   // For unit tests only.
   virtual void SetFileManager(DownloadFileManager* file_manager) OVERRIDE;
 
@@ -250,6 +253,8 @@ class CONTENT_EXPORT DownloadManagerImpl
   // For debugging only.
   int64 largest_db_handle_in_history_;
 
+  net::NetLog* net_log_;
+
   DISALLOW_COPY_AND_ASSIGN(DownloadManagerImpl);
 };