[fsp] Implement storage::WatcherManager for FSP.

chrome/browser/chromeos/file_system_provider/service.cc

 // Copyright 2014 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.
 
 #include "chrome/browser/chromeos/file_system_provider/service.h"
 
 #include "base/files/file_path.h"
 #include "base/prefs/pref_service.h"
 #include "base/prefs/scoped_user_pref_update.h"
 #include "base/stl_util.h"
@@ skipping 329 matching lines @@
   // invoked, and observers notified, so there is no need to call them now.
   if (error != base::File::FILE_OK) {
     FOR_EACH_OBSERVER(Observer,
                       observers_,
                       OnProvidedFileSystemUnmount(file_system_info, error));
   }
 }
 
 void Service::OnWatcherChanged(const ProvidedFileSystemInfo& file_system_info,
                                const Watcher& watcher,
-                               ChangeType change_type,
+                               storage::WatcherManager::ChangeType change_type,
                                const Changes& changes,
                                const base::Closure& callback) {
   callback.Run();
 }
 
 void Service::OnWatcherTagUpdated(
     const ProvidedFileSystemInfo& file_system_info,
     const Watcher& watcher) {
   PrefService* const pref_service = profile_->GetPrefs();
   DCHECK(pref_service);
 
   registry_->UpdateWatcherTag(file_system_info, watcher);
 }
 
 void Service::OnWatcherListChanged(
     const ProvidedFileSystemInfo& file_system_info,
     const Watchers& watchers) {
   registry_->RememberFileSystem(file_system_info, watchers);
 }
 
 }  // namespace file_system_provider
 }  // namespace chromeos