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

examples/bitmap_uploader/bitmap_uploader.cc

Index: examples/bitmap_uploader/bitmap_uploader.cc
diff --git a/examples/bitmap_uploader/bitmap_uploader.cc b/examples/bitmap_uploader/bitmap_uploader.cc
index c582666aa593dc695575da2401ebeb606d3d4ad4..e7afbd11ce9b8dc2bb3849c5b5671fa08f304657 100644
--- a/examples/bitmap_uploader/bitmap_uploader.cc
+++ b/examples/bitmap_uploader/bitmap_uploader.cc
@@ -61,11 +61,9 @@ void BitmapUploader::Init(Shell* shell) {
 
   CommandBufferPtr gles2_client;
   gpu_service_->CreateOffscreenGLES2Context(GetProxy(&gles2_client));
-  gles2_context_ =
-      MojoGLES2CreateContext(gles2_client.PassMessagePipe().release().value(),
-                             &LostContext,
-                             NULL,
-                             Environment::GetDefaultAsyncWaiter());
+  gles2_context_ = MojoGLES2CreateContext(
+      gles2_client.PassInterface().PassHandle().release().value(),
+      &LostContext, NULL, Environment::GetDefaultAsyncWaiter());
   MojoGLES2MakeCurrent(gles2_context_);
 }