Collapse the API surface on WebInputEvent via accessor functions.

ui/events/blink/blink_event_util.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef UI_EVENTS_BLINK_BLINK_EVENT_UTIL_H_
 #define UI_EVENTS_BLINK_BLINK_EVENT_UTIL_H_
 
 #include <memory>
 
 #include "third_party/WebKit/public/platform/WebGestureEvent.h"
@@ skipping 77 matching lines @@
 
 blink::WebInputEvent::Modifiers DomCodeToWebInputEventModifiers(
     ui::DomCode code);
 
 bool IsGestureScollOrPinch(blink::WebInputEvent::Type);
 
 bool IsContinuousGestureEvent(blink::WebInputEvent::Type);
 
 inline const blink::WebGestureEvent& ToWebGestureEvent(
     const blink::WebInputEvent& event) {
-  DCHECK(IsGestureScollOrPinch(event.type));
+  DCHECK(IsGestureScollOrPinch(event.type()));
   return static_cast<const blink::WebGestureEvent&>(event);
 }
 
 }  // namespace ui
 
 #endif  // UI_EVENTS_BLINK_BLINK_EVENT_UTIL_H_