Mojo: Move PlatformChannelPair to its own files.

mojo/system/platform_channel_pair_posix.cc

-// Copyright 2013 The Chromium Authors. All rights reserved.
+// Copyright 2014 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 "mojo/system/platform_channel.h"
+#include "mojo/system/platform_channel_pair.h"
 
 #include <fcntl.h>
 #include <sys/socket.h>
 #include <sys/types.h>
 #include <unistd.h>
 
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "base/posix/global_descriptors.h"
 #include "base/strings/string_number_conversions.h"
+#include "mojo/system/platform_channel.h"
 
 namespace mojo {
 namespace system {
 
 namespace {
 
 const char kMojoChannelDescriptorSwitch[] = "mojo-channel-descriptor";
 
 bool IsTargetDescriptorUsed(
     const base::FileHandleMappingVector& file_handle_mapping,
@@ skipping 71 matching lines @@
                                   base::IntToString(target_fd));
 }
 
 void PlatformChannelPair::ChildProcessLaunched() {
   DCHECK(client_handle_.is_valid());
   client_handle_.CloseIfNecessary();
 }
 
 }  // namespace system
 }  // namespace mojo