mediaview: Hack to avoid Files app to freeze soon after login.

chrome/browser/chromeos/arc/fileapi/arc_documents_provider_root.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 CHROME_BROWSER_CHROMEOS_ARC_FILEAPI_ARC_DOCUMENTS_PROVIDER_ROOT_H_
 #define CHROME_BROWSER_CHROMEOS_ARC_FILEAPI_ARC_DOCUMENTS_PROVIDER_ROOT_H_
 
 #include <stdint.h>
 
 #include <map>
@@ skipping 128 matching lines @@
 
   void ReadDirectoryWithDocumentId(const ReadDirectoryCallback& callback,
                                    const std::string& document_id);
   void ReadDirectoryWithNameToThinDocumentMap(
       const ReadDirectoryCallback& callback,
       base::File::Error error,
       NameToThinDocumentMap mapping);
 
   void AddWatcherWithDocumentId(const base::FilePath& path,
                                 const WatcherCallback& watcher_callback,
-                                const StatusCallback& callback,
                                 const std::string& document_id);
   void OnWatcherAdded(const base::FilePath& path,
-                      const StatusCallback& callback,
                       int64_t watcher_id);
-  void OnWatcherAddedButRemoved(const StatusCallback& callback, bool success);
+  void OnWatcherAddedButRemoved(bool success);
 
   void OnWatcherRemoved(const StatusCallback& callback, bool success);
 
   void ResolveToContentUrlWithDocumentId(
       const ResolveToContentUrlCallback& callback,
       const std::string& document_id);
 
   // Resolves |path| to a document ID. Failures are indicated by an empty
   // document ID.
   void ResolveToDocumentId(const base::FilePath& path,
@@ skipping 38 matching lines @@
       observer_wrapper_;
 
   base::WeakPtrFactory<ArcDocumentsProviderRoot> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ArcDocumentsProviderRoot);
 };
 
 }  // namespace arc
 
 #endif  // CHROME_BROWSER_CHROMEOS_ARC_FILEAPI_ARC_DOCUMENTS_PROVIDER_ROOT_H_