ui: Remove some unnecessary functions from the API.

ui/events/event_utils.h

Index: ui/events/event_utils.h
diff --git a/ui/events/event_utils.h b/ui/events/event_utils.h
index 87b720d58843ffccc425e3b2f324568a29118c6d..749ed92adfd6cf8f11d60c2557830729e13591eb 100644
--- a/ui/events/event_utils.h
+++ b/ui/events/event_utils.h
@@ -148,11 +148,6 @@ EVENTS_EXPORT bool ShouldDefaultToNaturalScroll();
 // Returns whether or not the internal display produces touch events.
 EVENTS_EXPORT gfx::Display::TouchSupport GetInternalDisplayTouchSupport();
 
-// Was this event generated by a touchpad device?
-// The caller is responsible for ensuring that this is a mouse/touchpad event
-// before calling this function.
-EVENTS_EXPORT bool IsTouchpadEvent(const base::NativeEvent& event);
-
 #if defined(OS_WIN)
 EVENTS_EXPORT int GetModifiersFromACCEL(const ACCEL& accel);
 EVENTS_EXPORT int GetModifiersFromKeyState();