Move PathExists to base namespace.

chrome/browser/extensions/api/file_system/file_system_api.cc

 // 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.
 
 #include "chrome/browser/extensions/api/file_system/file_system_api.h"
 
 #include "apps/saved_files_service.h"
 #include "apps/shell_window.h"
 #include "base/bind.h"
 #include "base/file_util.h"
@@ skipping 194 matching lines @@
                                          filesystem_path,
                                          render_view_host,
                                          &filesystem_id,
                                          file_path,
                                          error);
 }
 
 bool DoCheckWritableFile(const base::FilePath& path,
                          const base::FilePath& extension_directory) {
   // Don't allow links.
-  if (file_util::PathExists(path) && file_util::IsLink(path))
+  if (base::PathExists(path) && file_util::IsLink(path))
     return false;
 
   if (extension_directory == path || extension_directory.IsParent(path))
     return false;
 
   bool is_whitelisted_path = false;
 
 #if defined(OS_CHROMEOS)
   for (size_t i = 0; i < arraysize(kWhitelistedPaths); i++) {
     base::FilePath whitelisted_path;
@@ skipping 646 matching lines @@
     // ID that was passed to restoreEntry.
     RegisterFileSystemAndSendResponseWithIdOverride(
         file_entry->path,
         file_entry->writable ? WRITABLE : READ_ONLY,
         file_entry->id);
   }
   return true;
 }
 
 }  // namespace extensions