Remove UserGestureUtilizedCallback, it's unused outside of tests

third_party/WebKit/Source/core/dom/Fullscreen.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012 Apple Inc. All
  * rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved.
  * (http://www.torchmobile.com/)
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
@@ skipping 72 matching lines @@
   // 2. If Feature Policy is enabled, return the policy for "fullscreen"
   // feature.
   return frame->IsFeatureEnabled(WebFeaturePolicyFeature::kFullscreen);
 }
 
 bool AllowedToRequestFullscreen(Document& document) {
   // An algorithm is allowed to request fullscreen if one of the following is
   // true:
 
   //  The algorithm is triggered by a user activation.
-  if (UserGestureIndicator::UtilizeUserGesture())
+  if (UserGestureIndicator::ProcessingUserGesture())
     return true;
 
   //  The algorithm is triggered by a user generated orientation change.
   if (ScopedOrientationChangeIndicator::ProcessingOrientationChange()) {
     UseCounter::Count(document,
                       UseCounter::kFullscreenAllowedByOrientationChange);
     return true;
   }
 
   String message = ExceptionMessages::FailedToExecute(
@@ skipping 743 matching lines @@
 DEFINE_TRACE(Fullscreen) {
   visitor->Trace(pending_fullscreen_element_);
   visitor->Trace(fullscreen_element_stack_);
   visitor->Trace(current_full_screen_element_);
   visitor->Trace(event_queue_);
   Supplement<Document>::Trace(visitor);
   ContextLifecycleObserver::Trace(visitor);
 }
 
 }  // namespace blink