Remove canScroll from WebMouseWheelEvent as it is unused now.

ui/events/blink/input_handler_proxy.cc

Index: ui/events/blink/input_handler_proxy.cc
diff --git a/ui/events/blink/input_handler_proxy.cc b/ui/events/blink/input_handler_proxy.cc
index 9b13d93cd2496cb88dec75fdb796d236368319a6..b82e02dacfaba99b8334a620be6b8f3568a4cdd0 100644
--- a/ui/events/blink/input_handler_proxy.cc
+++ b/ui/events/blink/input_handler_proxy.cc
@@ -489,10 +489,6 @@ InputHandlerProxy::EventDisposition InputHandlerProxy::ScrollByMouseWheel(
         blink::WebGestureDeviceTouchpad,
         cc::MainThreadScrollingReason::kPageBasedScrolling);
 
-  } else if (!wheel_event.canScroll) {
-    // Wheel events with |canScroll| == false will not trigger scrolling,
-    // only event handlers.  Forward to the main thread.
-    result = DID_NOT_HANDLE;
   } else if (ShouldAnimate(wheel_event.hasPreciseScrollingDeltas)) {
     cc::InputHandler::ScrollStatus scroll_status =
         input_handler_->ScrollAnimated(gfx::Point(wheel_event.x, wheel_event.y),