Refactor AppendToFile and WriteFileDescriptor

chromeos/process_proxy/process_proxy.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 "chromeos/process_proxy/process_proxy.h"
 
 #include <fcntl.h>
 #include <stdlib.h>
 #include <sys/ioctl.h>
 
@@ skipping 142 matching lines @@
 
   CloseAllFdPairs();
 }
 
 bool ProcessProxy::Write(const std::string& text) {
   if (!process_launched_)
     return false;
 
   // We don't want to write '\0' to the pipe.
   size_t data_size = text.length() * sizeof(*text.c_str());
-  int bytes_written =
-      base::WriteFileDescriptor(pt_pair_[PT_MASTER_FD],
-                                text.c_str(), data_size);
-  return (bytes_written == static_cast<int>(data_size));
+  return base::WriteFileDescriptor(
+             pt_pair_[PT_MASTER_FD], text.c_str(), data_size);
 }
 
 bool ProcessProxy::OnTerminalResize(int width, int height) {
   if (width < 0 || height < 0)
     return false;
 
   winsize ws;
   // Number of rows.
   ws.ws_row = height;
   // Number of columns.
@@ skipping 82 matching lines @@
   ClearFdPair(pt_pair_);
   ClearFdPair(shutdown_pipe_);
 }
 
 void ProcessProxy::ClearFdPair(int* pipe) {
   pipe[PIPE_END_READ] = kInvalidFd;
   pipe[PIPE_END_WRITE] = kInvalidFd;
 }
 
 }  // namespace chromeos