Move FileEnumerator to its own file, do some refactoring.

third_party/leveldatabase/env_chromium.cc

 // Copyright (c) 2011 The LevelDB Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file. See the AUTHORS file for names of contributors.
 
 #include <errno.h>
 #include <stdio.h>
 
 #include <deque>
 
 #include "base/at_exit.h"
 #include "base/debug/trace_event.h"
 #include "base/file_util.h"
+#include "base/files/file_enumerator.h"
 #include "base/files/file_path.h"
 #include "base/lazy_instance.h"
 #include "base/memory/ref_counted.h"
 #include "base/message_loop.h"
 #include "base/metrics/histogram.h"
 #include "base/platform_file.h"
 #include "base/posix/eintr_wrapper.h"
 #include "base/synchronization/lock.h"
 #include "base/sys_info.h"
 #include "base/threading/platform_thread.h"
@@ skipping 560 matching lines @@
   }
 }
 
 bool ChromiumEnv::FileExists(const std::string& fname) {
   return ::file_util::PathExists(CreateFilePath(fname));
 }
 
 Status ChromiumEnv::GetChildren(const std::string& dir,
                                 std::vector<std::string>* result) {
   result->clear();
-  ::file_util::FileEnumerator iter(
-      CreateFilePath(dir), false, ::file_util::FileEnumerator::FILES);
+  base::FileEnumerator iter(
+      CreateFilePath(dir), false, base::FileEnumerator::FILES);
   base::FilePath current = iter.Next();
   while (!current.empty()) {
     result->push_back(FilePathToString(current.BaseName()));
     current = iter.Next();
   }
   // TODO(jorlow): Unfortunately, the FileEnumerator swallows errors, so
   //               we'll always return OK. Maybe manually check for error
   //               conditions like the file not existing?
   return Status::OK();
 }
@@ skipping 337 matching lines @@
 Env* IDBEnv() {
   return leveldb_env::idb_env.Pointer();
 }
 
 Env* Env::Default() {
   return leveldb_env::default_env.Pointer();
 }
 
 }  // namespace leveldb