Revert everything related to the relanding.

net/base/file_stream_posix.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.
 
 // For 64-bit file access (off_t = off64_t, lseek64, etc).
 #define _FILE_OFFSET_BITS 64
 
 #include "net/base/file_stream.h"
 
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <fcntl.h>
 #include <unistd.h>
 #include <errno.h>
 
 #include "base/basictypes.h"
 #include "base/callback.h"
 #include "base/eintr_wrapper.h"
 #include "base/file_path.h"
-#include "base/histogram.h"
 #include "base/logging.h"
 #include "base/message_loop.h"
 #include "base/string_util.h"
 #include "base/waitable_event.h"
 #include "base/worker_pool.h"
 #include "net/base/net_errors.h"
 
 // We cast back and forth, so make sure it's the size we're expecting.
 COMPILE_ASSERT(sizeof(int64) == sizeof(off_t), off_t_64_bit);
 
@@ skipping 443 matching lines @@
   int64 seek_position = Seek(FROM_BEGIN, bytes);
   if (seek_position != bytes)
     return ERR_UNEXPECTED;
 
   // And truncate the file.
   int result = ftruncate(file_, bytes);
   return result == 0 ? seek_position : MapErrorCode(errno);
 }
 
 }  // namespace net