file_util: Convert the wstring version of IsDirectoryEmpty to FilePath.

chrome/installer/setup/uninstall.cc

 // Copyright (c) 2010 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.
 //
 // This file defines the methods useful for uninstalling Chrome.
 
 #include "chrome/installer/setup/uninstall.h"
 
 #include "base/file_util.h"
 #include "base/path_service.h"
@@ skipping 124 matching lines @@
                  << grandparent_dir.value();
     }
   }
   return ret;
 }
 
 // Deletes empty parent & empty grandparent dir of given path.
 bool DeleteEmptyParentDir(const FilePath& path) {
   bool ret = true;
   FilePath parent_dir = path.DirName();
-  if (!parent_dir.empty() && file_util::IsDirectoryEmpty(parent_dir.value())) {
+  if (!parent_dir.empty() && file_util::IsDirectoryEmpty(parent_dir)) {
     if (!file_util::Delete(parent_dir, true)) {
       ret = false;
       LOG(ERROR) << "Failed to delete folder: " << parent_dir.value();
     }
 
     parent_dir = parent_dir.DirName();
-    if (!parent_dir.empty() &&
-        file_util::IsDirectoryEmpty(parent_dir.value())) {
+    if (!parent_dir.empty() && file_util::IsDirectoryEmpty(parent_dir)) {
       if (!file_util::Delete(parent_dir, true)) {
         ret = false;
         LOG(ERROR) << "Failed to delete folder: " << parent_dir.value();
       }
     }
   }
   return ret;
 }
 
 enum DeleteResult {
@@ skipping 426 matching lines @@
                                     distribution_data);
   }
 
   // Try and delete the preserved local state once the post-install
   // operations are complete.
   if (!local_state_path.empty())
     file_util::Delete(local_state_path, false);
 
   return ret;
 }