Collapse the API surface on WebInputEvent via accessor functions.

content/renderer/mus/compositor_mus_connection_unittest.cc

Index: content/renderer/mus/compositor_mus_connection_unittest.cc
diff --git a/content/renderer/mus/compositor_mus_connection_unittest.cc b/content/renderer/mus/compositor_mus_connection_unittest.cc
index 29a50ffe927033de468504bae8ca950fb32424c0..73c29881ec322d8136645712eb094c4aabccbc5e 100644
--- a/content/renderer/mus/compositor_mus_connection_unittest.cc
+++ b/content/renderer/mus/compositor_mus_connection_unittest.cc
@@ -207,7 +207,7 @@ void TestRenderWidgetInputHandler::HandleInputEvent(
     InputEventDispatchType dispatch_type) {
   if (delegate_) {
     std::unique_ptr<InputEventAck> ack(new InputEventAck(
-        InputEventAckSource::COMPOSITOR_THREAD, input_event.type, state_));
+        InputEventAckSource::COMPOSITOR_THREAD, input_event.type(), state_));
     delegate_->OnInputEventAck(std::move(ack));
   }
 }