Remove canScroll from WebMouseWheelEvent as it is unused now.

third_party/WebKit/public/web/WebInputEvent.h

Index: third_party/WebKit/public/web/WebInputEvent.h
diff --git a/third_party/WebKit/public/web/WebInputEvent.h b/third_party/WebKit/public/web/WebInputEvent.h
index 08ef45c6f02c0af656fdce96f309b574c5ee4a60..2084a7f218a1758488d020b9db5900470d27e272 100644
--- a/third_party/WebKit/public/web/WebInputEvent.h
+++ b/third_party/WebKit/public/web/WebInputEvent.h
@@ -440,12 +440,6 @@ public:
     bool scrollByPage;
     bool hasPreciseScrollingDeltas;
 
-    // When false, this wheel event should not trigger scrolling (or any other default
-    // action) if the event goes unhandled by JavaScript. This is used, for example,
-    // when the browser decides the default behavior for Ctrl+Wheel should be to zoom
-    // instead of scroll.
-    bool canScroll;
-
     RailsMode railsMode;
 
     // Whether the event is blocking, non-blocking, all event
@@ -467,7 +461,6 @@ public:
         , canRubberbandRight(true)
         , scrollByPage(false)
         , hasPreciseScrollingDeltas(false)
-        , canScroll(true)
         , railsMode(RailsModeFree)
         , dispatchType(Blocking)
     {