evdev: Move EventConverterOzone ownership from EventFactoryOzone to subclass

ui/events/ozone/evdev/event_factory.h

Index: ui/events/ozone/evdev/event_factory.h
diff --git a/ui/events/ozone/evdev/event_factory.h b/ui/events/ozone/evdev/event_factory.h
index f6840ffbc77907c6d5438f7984105687914dc635..7212e18c2df660de70ca1c9667798bf44ace1828 100644
--- a/ui/events/ozone/evdev/event_factory.h
+++ b/ui/events/ozone/evdev/event_factory.h
@@ -25,6 +25,9 @@ class EVENTS_EXPORT EventFactoryEvdev : public EventFactoryOzone {
   // Open device at path & starting processing events.
   void AttachInputDevice(const base::FilePath& file_path);
 
+  // Owned per-device event converters (by path).
+  std::map<base::FilePath, EventConverterOzone*> converters_;
+
   EventModifiersEvdev modifiers_;
 
   DISALLOW_COPY_AND_ASSIGN(EventFactoryEvdev);