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

mojo/services/html_viewer/blink_input_events_type_converters.h

Index: mojo/services/html_viewer/blink_input_events_type_converters.h
diff --git a/mojo/services/html_viewer/blink_input_events_type_converters.h b/mojo/services/html_viewer/blink_input_events_type_converters.h
index e40c02dd93f67c21f66d68ba3d18193da941f539..3d5860da426892ff304fcbc60cd9cf1996f60606 100644
--- a/mojo/services/html_viewer/blink_input_events_type_converters.h
+++ b/mojo/services/html_viewer/blink_input_events_type_converters.h
@@ -14,10 +14,9 @@ class WebInputEvent;
 
 namespace mojo {
 
-template<>
-class TypeConverter<EventPtr, scoped_ptr<blink::WebInputEvent> > {
- public:
-  static scoped_ptr<blink::WebInputEvent> ConvertTo(const EventPtr& input);
+template <>
+struct TypeConverter<scoped_ptr<blink::WebInputEvent>, EventPtr> {
+  static scoped_ptr<blink::WebInputEvent> Convert(const EventPtr& input);
 };
 
 }  // namespace mojo