Mojo C++ bindings: change the first template parameter of StructTraits and UnionTraits.

mojo/public/cpp/bindings/tests/rect_blink_traits.h

Index: mojo/public/cpp/bindings/tests/rect_blink_traits.h
diff --git a/mojo/public/cpp/bindings/tests/rect_blink_traits.h b/mojo/public/cpp/bindings/tests/rect_blink_traits.h
index c5f60686cc76abd2094441d088419cbeed505a4d..8e1fd5b83e2d9e145f82bea1296b8a547d2ec7ec 100644
--- a/mojo/public/cpp/bindings/tests/rect_blink_traits.h
+++ b/mojo/public/cpp/bindings/tests/rect_blink_traits.h
@@ -12,7 +12,7 @@
 namespace mojo {
 
 template <>
-struct StructTraits<test::blink::TypemappedRect, test::RectBlink> {
+struct StructTraits<test::blink::TypemappedRectDataView, test::RectBlink> {
   static int x(const test::RectBlink& r) { return r.x(); }
   static int y(const test::RectBlink& r) { return r.y(); }
   static int width(const test::RectBlink& r) { return r.width(); }