Remove some InterfacePtr<> methods which directly deal with message pipe handles.

services/surfaces/display_impl.cc

Index: services/surfaces/display_impl.cc
diff --git a/services/surfaces/display_impl.cc b/services/surfaces/display_impl.cc
index 217ebc5d70488fbcc7bf83cf55ad86e2b790b836..46585d3f7c4bb97da68db705ab2d86946cc1d492 100644
--- a/services/surfaces/display_impl.cc
+++ b/services/surfaces/display_impl.cc
@@ -48,7 +48,8 @@ void DisplayImpl::OnContextCreated(mojo::CommandBufferPtr gles2_client) {
   display_.reset(new cc::Display(this, manager_, nullptr, nullptr, settings));
   scheduler_->AddDisplay(display_.get());
   display_->Initialize(make_scoped_ptr(new mojo::DirectOutputSurface(
-      new mojo::ContextProviderMojo(gles2_client.PassMessagePipe()))));
+      new mojo::ContextProviderMojo(
+          gles2_client.PassInterface().PassHandle()))));
   display_->Resize(last_submitted_frame_size_);
 
   display_->SetSurfaceId(cc_id_, 1.f);