Move FilePathWatcher class from browser/... to common/...

chrome/common/file_path_watcher/file_path_watcher_stub.cc

 // Copyright (c) 2010 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.
 
 // This file exists for Unix systems which don't have the inotify headers, and
 // thus cannot build file_watcher_inotify.cc
 
-#include "chrome/browser/file_path_watcher/file_path_watcher.h"
+#include "chrome/common/file_path_watcher/file_path_watcher.h"
 
 class FilePathWatcherImpl : public FilePathWatcher::PlatformDelegate {
  public:
-  virtual bool Watch(const FilePath& path, FileWatcher::Delegate* delegate) {
+  virtual bool Watch(const FilePath& path,
+                     FileWatcher::Delegate* delegate,
+                     scoped_refptr<base::MessageLoopProxy>) OVERRIDE {
     return false;
   }
 };
 
 FilePathWatcher::FilePathWatcher() {
   impl_ = new FilePathWatcherImpl();
 }