drive: Remove FileCacheTestOnUIThread

chrome/browser/chromeos/drive/file_cache.h

 // Copyright (c) 2012 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_DRIVE_FILE_CACHE_H_
 #define CHROME_BROWSER_CHROMEOS_DRIVE_FILE_CACHE_H_
 
 #include <set>
 #include <string>
 
@@ skipping 129 matching lines @@
   // |dest_directory|.
   // |recovered_cache_info| should contain cache info recovered from the trashed
   // metadata DB. It is used to ignore non-dirty files.
   bool RecoverFilesFromCacheDirectory(
       const base::FilePath& dest_directory,
       const ResourceMetadataStorage::RecoveredCacheInfoMap&
           recovered_cache_info);
 
  private:
   friend class FileCacheTest;
-  friend class FileCacheTestOnUIThread;
 
   ~FileCache();
 
   // Returns absolute path of the file if it were cached or to be cached.
   //
   // Can be called on any thread.
   base::FilePath GetCacheFilePath(const std::string& id) const;
 
   // Checks whether the current thread is on the right sequenced worker pool
   // with the right sequence ID. If not, DCHECK will fail.
@@ skipping 32 matching lines @@
   // invalidate its weak pointers before any other members are destroyed.
   // This object should be accessed only on |blocking_task_runner_|.
   base::WeakPtrFactory<FileCache> weak_ptr_factory_;
   DISALLOW_COPY_AND_ASSIGN(FileCache);
 };
 
 }  // namespace internal
 }  // namespace drive
 
 #endif  // CHROME_BROWSER_CHROMEOS_DRIVE_FILE_CACHE_H_