[mojo] Use a pipe path to initialise Mojo in elevated utility processes.

content/browser/child_process_launcher.h

 // 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.
 
 #ifndef CONTENT_BROWSER_CHILD_PROCESS_LAUNCHER_H_
 #define CONTENT_BROWSER_CHILD_PROCESS_LAUNCHER_H_
 
 #include "base/files/scoped_file.h"
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "base/process/kill.h"
 #include "base/process/launch.h"
 #include "base/process/process.h"
 #include "base/threading/non_thread_safe.h"
 #include "build/build_config.h"
 #include "content/common/content_export.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/common/sandboxed_process_launcher_delegate.h"
-#include "mojo/edk/embedder/platform_channel_pair.h"
+#include "mojo/edk/embedder/scoped_platform_handle.h"
 
 #if defined(OS_WIN)
 #include "sandbox/win/src/sandbox_types.h"
 #endif
 
 namespace base {
 class CommandLine;
 }
 
 namespace content {
@@ skipping 118 matching lines @@
   BrowserThread::ID client_thread_id_;
   base::Process process_;
   base::TerminationStatus termination_status_;
   int exit_code_;
   ZygoteHandle zygote_;
   bool starting_;
   // Controls whether the child process should be terminated on browser
   // shutdown. Default behavior is to terminate the child.
   const bool terminate_child_on_shutdown_;
 
-  // Platform channel used to establish Mojo IPC.
-  mojo::edk::PlatformChannelPair mojo_platform_channel_;
+  // Host side platform handle to establish Mojo IPC.
+  mojo::edk::ScopedPlatformHandle mojo_host_platform_handle_;
 
   base::WeakPtrFactory<ChildProcessLauncher> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ChildProcessLauncher);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_CHILD_PROCESS_LAUNCHER_H_