Use ChannelMojo for plugin-renderer channels.

content/renderer/pepper/plugin_module.cc

Index: content/renderer/pepper/plugin_module.cc
diff --git a/content/renderer/pepper/plugin_module.cc b/content/renderer/pepper/plugin_module.cc
index 4afc90b8c72219c064e92be1d14e0a332052af18..13444804bb2171c212047451b6a4b1977a0bfd3c 100644
--- a/content/renderer/pepper/plugin_module.cc
+++ b/content/renderer/pepper/plugin_module.cc
@@ -801,7 +801,7 @@ scoped_refptr<PluginModule> PluginModule::Create(
   int plugin_child_id = 0;
   render_frame->Send(new FrameHostMsg_OpenChannelToPepperPlugin(
       path, &channel_handle, &peer_pid, &plugin_child_id));
-  if (channel_handle.name.empty()) {
+  if (!channel_handle.is_mojo_channel_handle()) {
     // Couldn't be initialized.
     return scoped_refptr<PluginModule>();
   }