Remove canScroll from WebMouseWheelEvent as it is unused now.

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 2f9ca8c5232ef97f4ae4ae342bae63a494cbee74..31d22fe81649a34959a5e49340d05df5915d20ab 100644
--- a/content/common/input/web_input_event_traits.h
+++ b/content/common/input/web_input_event_traits.h
@@ -29,6 +29,8 @@ class CONTENT_EXPORT WebInputEventTraits {
                        blink::WebInputEvent* event);
   static bool ShouldBlockEventStream(const blink::WebInputEvent& event);
 
+  static bool CanCauseScroll(const blink::WebMouseWheelEvent& event);
+
   // Return uniqueTouchEventId for WebTouchEvent, otherwise return 0.
   static uint32_t GetUniqueTouchEventId(const blink::WebInputEvent& event);
 };