Remove ChildProcessMsg_SetMojoParentPipeHandle message.

content/browser/browser_child_process_host_impl.cc

Index: content/browser/browser_child_process_host_impl.cc
diff --git a/content/browser/browser_child_process_host_impl.cc b/content/browser/browser_child_process_host_impl.cc
index 76b63e5df79f6b8467037cd496a907fc18b30020..8986295fd0a40b3977028d5d68030c0ef17a583f 100644
--- a/content/browser/browser_child_process_host_impl.cc
+++ b/content/browser/browser_child_process_host_impl.cc
@@ -407,11 +407,6 @@ void BrowserChildProcessHostImpl::OnProcessLaunched() {
   const base::Process& process = child_process_->GetProcess();
   DCHECK(process.IsValid());
 
-  mojo::edk::ScopedPlatformHandle client_pipe =
-      mojo::edk::ChildProcessLaunched(process.Handle());
-  Send(new ChildProcessMsg_SetMojoParentPipeHandle(
-      IPC::GetPlatformFileForTransit(client_pipe.release().handle, true)));
-
 #if defined(OS_WIN)
   // Start a WaitableEventWatcher that will invoke OnProcessExitedEarly if the
   // child process exits. This watcher is stopped once the IPC channel is