Remove canScroll from WebMouseWheelEvent as it is unused now.

content/browser/web_contents/web_contents_impl.cc

Index: content/browser/web_contents/web_contents_impl.cc
diff --git a/content/browser/web_contents/web_contents_impl.cc b/content/browser/web_contents/web_contents_impl.cc
index a765509ab267c2910635e57728031b46d1b37006..730737658dc6278ce058d87d3f811811f4bd673c 100644
--- a/content/browser/web_contents/web_contents_impl.cc
+++ b/content/browser/web_contents/web_contents_impl.cc
@@ -1763,8 +1763,7 @@ bool WebContentsImpl::HandleWheelEvent(
   //      (i.e. control+tab) then the OS's buffered scroll events will come in
   //      with control key set which isn't what the user wants
   if (delegate_ && event.wheelTicksY &&
-      (event.modifiers & blink::WebInputEvent::ControlKey) &&
-      !event.canScroll) {
+      !WebInputEventTraits::ShouldCauseScroll(event)) {
     // Count only integer cumulative scrolls as zoom events; this handles
     // smooth scroll and regular scroll device behavior.
     zoom_scroll_remainder_ += event.wheelTicksY;