Use ChannelMojo for plugin-renderer channels.

components/nacl/renderer/ppb_nacl_private_impl.cc

Index: components/nacl/renderer/ppb_nacl_private_impl.cc
diff --git a/components/nacl/renderer/ppb_nacl_private_impl.cc b/components/nacl/renderer/ppb_nacl_private_impl.cc
index 98d16f3ac85e6b2b096d3b685a50b52a4df1340d..0957f2b045453cd00ad9ed14e82d740ec7c27cc9 100644
--- a/components/nacl/renderer/ppb_nacl_private_impl.cc
+++ b/components/nacl/renderer/ppb_nacl_private_impl.cc
@@ -132,13 +132,8 @@ class NaClPluginInstance {
   ~NaClPluginInstance() {
     // Make sure that we do not leak a file descriptor if the NaCl loader
     // process never called ppapi_start() to initialize PPAPI.
-    if (instance_info) {
-#if defined(OS_WIN)
-      base::win::ScopedHandle closer(instance_info->channel_handle.pipe.handle);
-#else
-      base::ScopedFD closer(instance_info->channel_handle.socket.fd);
-#endif
-    }
+    if (instance_info)
+      instance_info->channel_handle.mojo_handle.Close();
   }
 
   NexeLoadManager nexe_load_manager;