Change mojo enums to be scoped enums in the generated C++ bindings.

mojo/converters/surfaces/surfaces_utils.cc

Index: mojo/converters/surfaces/surfaces_utils.cc
diff --git a/mojo/converters/surfaces/surfaces_utils.cc b/mojo/converters/surfaces/surfaces_utils.cc
index d0793afe33edab62d199d81a17462cf699e1598d..239263ffa6d1c7d59fa56980f7fc75ae76aea6e5 100644
--- a/mojo/converters/surfaces/surfaces_utils.cc
+++ b/mojo/converters/surfaces/surfaces_utils.cc
@@ -26,7 +26,7 @@ SharedQuadStatePtr CreateDefaultSQS(const gfx::Size& size) {
   sqs->clip_rect = Rect::From(gfx::Rect(size));
   sqs->is_clipped = false;
   sqs->opacity = 1.f;
-  sqs->blend_mode = mus::mojom::SK_XFERMODE_kSrc_Mode;
+  sqs->blend_mode = mus::mojom::SkXfermode::kSrc_Mode;
   sqs->sorting_context_id = 0;
   return sqs;
 }