Cleans up events to just the parts we're actually using

mojo/converters/input_events/input_events_type_converters.h

Index: mojo/converters/input_events/input_events_type_converters.h
diff --git a/mojo/converters/input_events/input_events_type_converters.h b/mojo/converters/input_events/input_events_type_converters.h
index 9a717829137adacf6c80951179f05c5f1cf61681..f59f9d3c317ea6dd284e6ad152ca8539cda78957 100644
--- a/mojo/converters/input_events/input_events_type_converters.h
+++ b/mojo/converters/input_events/input_events_type_converters.h
@@ -12,17 +12,14 @@
 
 namespace mojo {
 
+// NOTE: the mojo input events do not necessarily provide a 1-1 mapping with
+// ui::Event types. Be careful in using them!
 template <>
 struct MOJO_INPUT_EVENTS_EXPORT TypeConverter<EventType, ui::EventType> {
   static EventType Convert(ui::EventType type);
 };
 
 template <>
-struct MOJO_INPUT_EVENTS_EXPORT TypeConverter<ui::EventType, EventType> {
-  static ui::EventType Convert(EventType type);
-};
-
-template <>
 struct MOJO_INPUT_EVENTS_EXPORT TypeConverter<EventPtr, ui::Event> {
   static EventPtr Convert(const ui::Event& input);
 };