Use ChannelMojo in Pepper and NaCl processes.

content/browser/ppapi_plugin_process_host.h

Index: content/browser/ppapi_plugin_process_host.h
diff --git a/content/browser/ppapi_plugin_process_host.h b/content/browser/ppapi_plugin_process_host.h
index 7c649017633313b0fc7a6cb7667b3753eb38bb8e..96aadea6009fe0bd4d673553573a6d32936e1a88 100644
--- a/content/browser/ppapi_plugin_process_host.h
+++ b/content/browser/ppapi_plugin_process_host.h
@@ -175,6 +175,9 @@ class PpapiPluginProcessHost : public BrowserChildProcessHostDelegate,
 
   const bool is_broker_;
 
+  // Randomly generated token identifying the child process to Mojo.
+  const std::string mojo_child_token_;
+
   std::unique_ptr<BrowserChildProcessHostImpl> process_;
 
   DISALLOW_COPY_AND_ASSIGN(PpapiPluginProcessHost);