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/stringprintf.h"
 #include "base/synchronization/lock.h"
 #include "base/sys_info.h"
@@ skipping 424 matching lines @@
     }
   }
 
   virtual bool FileExists(const std::string& fname) {
     return ::file_util::PathExists(CreateFilePath(fname));
   }
 
   virtual Status 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 356 matching lines @@
 
 Env* IDBEnv() {
   return idb_env.Pointer();
 }
 
 Env* Env::Default() {
   return default_env.Pointer();
 }
 
 }