Move PathExists to base namespace.

chrome/browser/chromeos/drive/fake_file_system.cc

 // Copyright (c) 2013 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/drive/fake_file_system.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/callback.h"
 #include "base/file_util.h"
@@ skipping 277 matching lines @@
     completion_callback.Run(error);
     return;
   }
   DCHECK(gdata_entry);
 
   scoped_ptr<ResourceEntry> entry(
       new ResourceEntry(ConvertToResourceEntry(*gdata_entry)));
 
   base::FilePath cache_path =
       cache_dir_.path().AppendASCII(entry->resource_id());
-  if (file_util::PathExists(cache_path)) {
+  if (base::PathExists(cache_path)) {
     // Cache file is found.
     initialized_callback.Run(FILE_ERROR_OK, entry.Pass(), cache_path,
                              base::Closure());
     completion_callback.Run(FILE_ERROR_OK);
     return;
   }
 
   initialized_callback.Run(FILE_ERROR_OK, entry.Pass(), base::FilePath(),
                            base::Bind(&base::DoNothing));
   drive_service_->DownloadFile(
@@ skipping 79 matching lines @@
       callback.Run(FILE_ERROR_OK, entry.Pass());
       return;
     }
   }
 
   callback.Run(FILE_ERROR_NOT_FOUND, scoped_ptr<ResourceEntry>());
 }
 
 }  // namespace test_util
 }  // namespace drive