Rename the download to its final name only after the download is finished

base/file_path.h

Index: base/file_path.h
diff --git a/base/file_path.h b/base/file_path.h
index 6484c5a1b3e8da9509bda3580cec4cf0ca9f8d38..6887cdc96a1e1fd18a5a7cc83f3737101cfc3cc2 100644
--- a/base/file_path.h
+++ b/base/file_path.h
@@ -357,9 +357,11 @@ class FilePath {
 #if defined(OS_POSIX)
 #define FILE_PATH_LITERAL(x) x
 #define PRFilePath "s"
+#define PRFilePathLiteral "%s"
 #elif defined(OS_WIN)
 #define FILE_PATH_LITERAL(x) L ## x
 #define PRFilePath "ls"
+#define PRFilePathLiteral L"%ls"
 #endif  // OS_WIN
 
 // Provide a hash function so that hash_sets and maps can contain FilePath