Mojo: Replace RemotePtr with InterfacePtr and InterfaceImpl

mojo/examples/aura_demo/window_tree_host_mojo.cc

Index: mojo/examples/aura_demo/window_tree_host_mojo.cc
diff --git a/mojo/examples/aura_demo/window_tree_host_mojo.cc b/mojo/examples/aura_demo/window_tree_host_mojo.cc
index c598dce7748183113df35a7ce4b32545e9a98d1f..26ffedc3437f064b2e253d6829ecc7c92b0d6d76 100644
--- a/mojo/examples/aura_demo/window_tree_host_mojo.cc
+++ b/mojo/examples/aura_demo/window_tree_host_mojo.cc
@@ -27,12 +27,14 @@ ui::ContextFactory* WindowTreeHostMojo::context_factory_ = NULL;
 // WindowTreeHostMojo, public:
 
 WindowTreeHostMojo::WindowTreeHostMojo(
-    ScopedNativeViewportHandle viewport_handle,
+    NativeViewportPtr viewport,
     const gfx::Rect& bounds,
     const base::Callback<void()>& compositor_created_callback)
-    : native_viewport_(viewport_handle.Pass(), this),
+    : native_viewport_(viewport.Pass()),
       compositor_created_callback_(compositor_created_callback),
       bounds_(bounds) {
+  native_viewport_->SetClient(this);
+
   AllocationScope scope;
   native_viewport_->Create(bounds);