Mojo C++ bindings: Generate InterfaceHandle<> instead of InterfacePtr<>.

services/native_viewport/native_viewport_impl.h

Index: services/native_viewport/native_viewport_impl.h
diff --git a/services/native_viewport/native_viewport_impl.h b/services/native_viewport/native_viewport_impl.h
index 3391e8830d0f97dec9a3a09c564bca0c50eac05e..bad5f2a3b43402a9d9ab6eda674ffdffa0848fd3 100644
--- a/services/native_viewport/native_viewport_impl.h
+++ b/services/native_viewport/native_viewport_impl.h
@@ -55,7 +55,8 @@ class NativeViewportImpl : public mojo::NativeViewport,
   void GetContextProvider(
       mojo::InterfaceRequest<mojo::ContextProvider> request) override;
   void SetEventDispatcher(
-      mojo::NativeViewportEventDispatcherPtr dispatcher) override;
+      mojo::InterfaceHandle<mojo::NativeViewportEventDispatcher> dispatcher)
+      override;
 
   // PlatformViewport::Delegate implementation.
   void OnMetricsChanged(mojo::ViewportMetricsPtr metrics) override;