Use ChannelMojo from the browser to NaCl loader process.

components/nacl/browser/nacl_process_host.h

Index: components/nacl/browser/nacl_process_host.h
diff --git a/components/nacl/browser/nacl_process_host.h b/components/nacl/browser/nacl_process_host.h
index 342afcca12376141844f3049e138f81592783305..528e889aa615dbf974936848ee14fca85da14d5a 100644
--- a/components/nacl/browser/nacl_process_host.h
+++ b/components/nacl/browser/nacl_process_host.h
@@ -265,6 +265,9 @@ class NaClProcessHost : public content::BrowserChildProcessHostDelegate {
   // reporting crash information.
   base::SharedMemory crash_info_shmem_;
 
+  // Randomly generated token identifying the child process to Mojo.
+  std::string mojo_child_token_;
+
   base::WeakPtrFactory<NaClProcessHost> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(NaClProcessHost);