Fix races when the same bits are downloaded from 2 URLs.

shell/application_manager/network_fetcher.h

Index: shell/application_manager/network_fetcher.h
diff --git a/shell/application_manager/network_fetcher.h b/shell/application_manager/network_fetcher.h
index ff4152724ccbe97ba9c21f9e92255c563098d178..a5ef1541ddb43baac02aacf953200d21bc30e5ff 100644
--- a/shell/application_manager/network_fetcher.h
+++ b/shell/application_manager/network_fetcher.h
@@ -46,7 +46,8 @@ class NetworkFetcher : public Fetcher {
   static bool ComputeAppId(const base::FilePath& path,
                            std::string* digest_string);
 
-  static bool RenameToAppId(const base::FilePath& old_path,
+  static bool RenameToAppId(const GURL& url,
+                            const base::FilePath& old_path,
                             base::FilePath* new_path);
 
   void CopyCompleted(base::Callback<void(const base::FilePath&, bool)> callback,