Add mojom module suffix in .mojom files for components/filesystem.

components/filesystem/public/interfaces/types.mojom

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-module filesystem;
+module filesystem.mojom;
 
 // Error codes used by the file system. These error codes line up exactly with
 // those of base::File.
 enum FileError {
   OK                =   0,
   FAILED            =  -1,
   IN_USE            =  -2,
   EXISTS            =  -3,
   NOT_FOUND         =  -4,
   ACCESS_DENIED     =  -5,
@@ skipping 76 matching lines @@
 
 // Describes a directory entry (i.e., a single member of a directory).
 struct DirectoryEntry {
   FsFileType type;
   string name;
 };
 
 // Deletion flags:
 // Recursively delete.
 const uint32 kDeleteFlagRecursive = 0x1;