Change TypeConverter<X,Y>::ConvertFrom and ConvertTo into a single symmetric

mojo/services/native_viewport/native_viewport_impl.cc

Index: mojo/services/native_viewport/native_viewport_impl.cc
diff --git a/mojo/services/native_viewport/native_viewport_impl.cc b/mojo/services/native_viewport/native_viewport_impl.cc
index 0b871dc33845e9bc335f7ccecb4715d447585f1d..0dd20112b441333ded7214514ae8898fe9f13daa 100644
--- a/mojo/services/native_viewport/native_viewport_impl.cc
+++ b/mojo/services/native_viewport/native_viewport_impl.cc
@@ -89,9 +89,8 @@ bool NativeViewportImpl::OnEvent(ui::Event* ui_event) {
     return false;
 
   client()->OnEvent(
-      TypeConverter<EventPtr, ui::Event>::ConvertFrom(*ui_event),
-      base::Bind(&NativeViewportImpl::AckEvent,
-                 weak_factory_.GetWeakPtr()));
+      Event::From(*ui_event),
+      base::Bind(&NativeViewportImpl::AckEvent, weak_factory_.GetWeakPtr()));
   waiting_for_event_ack_ = true;
   return false;
 }