Collapse the API surface on WebInputEvent via accessor functions.

content/renderer/render_view_impl.cc

Index: content/renderer/render_view_impl.cc
diff --git a/content/renderer/render_view_impl.cc b/content/renderer/render_view_impl.cc
index af38e868c82c846dfa1b38f55b042d56b3f82387..6d5eab5bc1b34112e91e865e5d6ff6618cab66e3 100644
--- a/content/renderer/render_view_impl.cc
+++ b/content/renderer/render_view_impl.cc
@@ -2815,12 +2815,12 @@ void RenderViewImpl::OnDiscardInputEvent(
   }
 
   if (dispatch_type == DISPATCH_TYPE_BLOCKING_NOTIFY_MAIN) {
-    NotifyInputEventHandled(input_event->type,
+    NotifyInputEventHandled(input_event->type(),
                             INPUT_EVENT_ACK_STATE_NOT_CONSUMED);
   }
 
   std::unique_ptr<InputEventAck> ack(
-      new InputEventAck(InputEventAckSource::MAIN_THREAD, input_event->type,
+      new InputEventAck(InputEventAckSource::MAIN_THREAD, input_event->type(),
                         INPUT_EVENT_ACK_STATE_NOT_CONSUMED));
   OnInputEventAck(std::move(ack));
 }