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

components/filesystem/shared_temp_dir.h

 // Copyright 2016 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.
 
 #ifndef COMPONENTS_FILESYSTEM_SHARED_TEMP_DIR_H_
 #define COMPONENTS_FILESYSTEM_SHARED_TEMP_DIR_H_
 
 #include "base/memory/ref_counted.h"
 
 namespace base {
 class ScopedTempDir;
 }
 
 namespace filesystem {
 
-// A class to allow multiple Directory objects to hold a reference to a
+// A class to allow multiple mojom::Directory objects to hold a reference to a
 // temporary directory.
 class SharedTempDir : public base::RefCounted<SharedTempDir> {
  public:
   SharedTempDir(std::unique_ptr<base::ScopedTempDir> temp_dir);
 
  private:
   friend class base::RefCounted<SharedTempDir>;
   ~SharedTempDir();
 
   std::unique_ptr<base::ScopedTempDir> temp_dir_;
 
   DISALLOW_COPY_AND_ASSIGN(SharedTempDir);
 };
 
 }  // namespace filesystem
 
 #endif  // COMPONENTS_FILESYSTEM_SHARED_TEMP_DIR_H_