Remove canScroll from WebMouseWheelEvent as it is unused now.

content/browser/renderer_host/web_input_event_aura.cc

Index: content/browser/renderer_host/web_input_event_aura.cc
diff --git a/content/browser/renderer_host/web_input_event_aura.cc b/content/browser/renderer_host/web_input_event_aura.cc
index 3ed96dc0fc654159953dfe11fe8321fc8cd38304..1b004db342befd91d3f2021bc6e6fe57481b2c29 100644
--- a/content/browser/renderer_host/web_input_event_aura.cc
+++ b/content/browser/renderer_host/web_input_event_aura.cc
@@ -256,14 +256,6 @@ blink::WebMouseWheelEvent MakeWebMouseWheelEvent(
   webkit_event.globalX = screen_point.x();
   webkit_event.globalY = screen_point.y();
 
-  // Scroll events generated from the mouse wheel when the control key is held
-  // don't trigger scrolling. Instead, they may cause zooming.
-  bool from_mouse_wheel = !webkit_event.hasPreciseScrollingDeltas;
-  if ((webkit_event.modifiers & blink::WebInputEvent::ControlKey) &&
-      from_mouse_wheel) {
-    webkit_event.canScroll = false;
-  }
-
   return webkit_event;
 }