Mojo: Move PlatformChannelPair to its own files.

mojo/common/test/multiprocess_test_base.cc

 // Copyright 2013 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/common/test/multiprocess_test_base.h"
 
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "base/process/kill.h"
 #include "base/process/process_handle.h"
 // TODO(vtl): Remove build_config.h include when fully implemented on Windows.
 #include "build/build_config.h"
+#include "mojo/system/platform_channel.h"
+#include "mojo/system/platform_channel_pair.h"
 
 namespace mojo {
 namespace test {
 
 MultiprocessTestBase::MultiprocessTestBase()
     : test_child_handle_(base::kNullProcessHandle) {
 }
 
 MultiprocessTestBase::~MultiprocessTestBase() {
   CHECK_EQ(test_child_handle_, base::kNullProcessHandle);
@@ skipping 84 matching lines @@
   CHECK(client_platform_channel.get());
 #endif
 }
 
 // static
 scoped_ptr<system::PlatformChannel>
     MultiprocessTestBase::client_platform_channel;
 
 }  // namespace test
 }  // namespace mojo