Fix an uninitialized field in the fileSystem.retainEntry implementation.

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 "apps/shell_window_registry.h"
 #include "base/bind.h"
@@ skipping 956 matching lines @@
 void FileSystemRetainEntryFunction::RetainFileEntry(
     const std::string& entry_id) {
   SavedFilesService* saved_files_service = SavedFilesService::Get(profile());
   saved_files_service->RegisterFileEntry(
       extension_->id(), entry_id, path_, is_directory_);
   saved_files_service->EnqueueFileEntry(extension_->id(), entry_id);
   SendResponse(true);
 }
 
 void FileSystemRetainEntryFunction::SetIsDirectoryOnFileThread() {
-  if (base::DirectoryExists(path_)) {
-    is_directory_ = true;
-  }
+  is_directory_ = base::DirectoryExists(path_);
 }
 
 bool FileSystemIsRestorableFunction::RunImpl() {
   std::string entry_id;
   EXTENSION_FUNCTION_VALIDATE(args_->GetString(0, &entry_id));
   SetResult(new base::FundamentalValue(SavedFilesService::Get(
       profile())->IsRegistered(extension_->id(), entry_id)));
   return true;
 }
 
@@ skipping 18 matching lines @@
   if (needs_new_entry) {
     is_directory_ = file_entry->is_directory;
     CreateResponse();
     AddEntryToResponse(file_entry->path, file_entry->id);
   }
   SendResponse(true);
   return true;
 }
 
 }  // namespace extensions