Remove task.h and finish base::Bind() migration.

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 <deque>
 #include <errno.h>
 #include <stdio.h>
 #include "base/at_exit.h"
 #include "base/file_path.h"
 #include "base/file_util.h"
 #include "base/lazy_instance.h"
 #include "base/memory/ref_counted.h"
 #include "base/message_loop.h"
 #include "base/platform_file.h"
 #include "base/process_util.h"
 #include "base/stringprintf.h"
 #include "base/synchronization/lock.h"
 #include "base/sys_info.h"
-#include "base/task.h"
 #include "base/threading/platform_thread.h"
 #include "base/threading/thread.h"
 #include "base/utf_string_conversions.h"
 #include "leveldb/env.h"
 #include "leveldb/slice.h"
 #include "port/port.h"
 #include "util/logging.h"
 
 #if defined(OS_WIN)
 #include <io.h>
@@ skipping 518 matching lines @@
 ::base::LazyInstance<ChromiumEnv, ::base::LeakyLazyInstanceTraits<ChromiumEnv> >
     default_env = LAZY_INSTANCE_INITIALIZER;
 
 }
 
 Env* Env::Default() {
   return default_env.Pointer();
 }
 
 }