Remove UserGestureUtilizedCallback, it's unused outside of tests

third_party/WebKit/Source/modules/vr/VRDisplay.cpp

 // Copyright 2016 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.
 
 #include "modules/vr/VRDisplay.h"
 
 #include "core/css/StylePropertySet.h"
 #include "core/dom/DOMException.h"
 #include "core/dom/FrameRequestCallback.h"
 #include "core/dom/ScriptedAnimationController.h"
@@ skipping 188 matching lines @@
     ReportPresentationResult(PresentationResult::kVRDisplayCannotPresent);
     return promise;
   }
 
   bool first_present = !is_presenting_;
 
   // Initiating VR presentation is only allowed in response to a user gesture.
   // If the VRDisplay is already presenting, however, repeated calls are
   // allowed outside a user gesture so that the presented content may be
   // updated.
-  if (first_present && !UserGestureIndicator::UtilizeUserGesture() &&
+  if (first_present && !UserGestureIndicator::ProcessingUserGesture() &&
       !in_display_activate_) {
     DOMException* exception = DOMException::Create(
         kInvalidStateError, "API can only be initiated by a user gesture.");
     resolver->Reject(exception);
     ReportPresentationResult(PresentationResult::kNotInitiatedByUserGesture);
     return promise;
   }
 
   // A valid number of layers must be provided in order to present.
   if (layers.size() == 0 || layers.size() > capabilities_->maxLayers()) {
@@ skipping 593 matching lines @@
   visitor->Trace(stage_parameters_);
   visitor->Trace(eye_parameters_left_);
   visitor->Trace(eye_parameters_right_);
   visitor->Trace(layer_);
   visitor->Trace(rendering_context_);
   visitor->Trace(scripted_animation_controller_);
   visitor->Trace(pending_present_resolvers_);
 }
 
 }  // namespace blink