Decouple EventWithLatencyInfo and WebInputEventTraits [extern templates]

content/common/input/web_input_event_traits.h

Index: content/common/input/web_input_event_traits.h
diff --git a/content/common/input/web_input_event_traits.h b/content/common/input/web_input_event_traits.h
index 31d22fe81649a34959a5e49340d05df5915d20ab..df83ca6f44ab30cd43a5abfb431359f191436396 100644
--- a/content/common/input/web_input_event_traits.h
+++ b/content/common/input/web_input_event_traits.h
@@ -23,10 +23,6 @@ class CONTENT_EXPORT WebInputEventTraits {
   static size_t GetSize(blink::WebInputEvent::Type type);
   static ScopedWebInputEvent Clone(const blink::WebInputEvent& event);
   static void Delete(blink::WebInputEvent* event);
-  static bool CanCoalesce(const blink::WebInputEvent& event_to_coalesce,
-                          const blink::WebInputEvent& event);
-  static void Coalesce(const blink::WebInputEvent& event_to_coalesce,
-                       blink::WebInputEvent* event);
   static bool ShouldBlockEventStream(const blink::WebInputEvent& event);
 
   static bool CanCauseScroll(const blink::WebMouseWheelEvent& event);