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

services/gfx/compositor/compositor_engine.cc

Index: services/gfx/compositor/compositor_engine.cc
diff --git a/services/gfx/compositor/compositor_engine.cc b/services/gfx/compositor/compositor_engine.cc
index 8f6990826187d562a0d647e7a76255a37dfe6ba7..448d689b87411e6614b52a8f7648d4728bf7dad9 100644
--- a/services/gfx/compositor/compositor_engine.cc
+++ b/services/gfx/compositor/compositor_engine.cc
@@ -99,7 +99,7 @@ void CompositorEngine::DestroyScene(SceneState* scene_state) {
 }
 
 void CompositorEngine::CreateRenderer(
-    mojo::ContextProviderPtr context_provider,
+    mojo::InterfaceHandle<mojo::ContextProvider> context_provider,
     mojo::InterfaceRequest<mojo::gfx::composition::Renderer> renderer_request,
     const mojo::String& label) {
   DCHECK(context_provider);