Remove UserGestureUtilizedCallback, it's unused outside of tests

third_party/WebKit/Source/modules/remoteplayback/RemotePlayback.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/remoteplayback/RemotePlayback.h"
 
 #include "bindings/core/v8/ScriptPromiseResolver.h"
 #include "bindings/modules/v8/RemotePlaybackAvailabilityCallback.h"
 #include "core/HTMLNames.h"
 #include "core/dom/DOMException.h"
@@ skipping 159 matching lines @@
     return promise;
   }
 
   if (prompt_promise_resolver_) {
     resolver->Reject(DOMException::Create(
         kOperationError,
         "A prompt is already being shown for this media element."));
     return promise;
   }
 
-  if (!UserGestureIndicator::UtilizeUserGesture()) {
+  if (!UserGestureIndicator::ProcessingUserGesture()) {
     resolver->Reject(DOMException::Create(
         kInvalidAccessError,
         "RemotePlayback::prompt() requires user gesture."));
     return promise;
   }
 
   // TODO(avayvod): don't do this check on low-end devices - merge with
   // https://codereview.chromium.org/2475293003
   if (availability_ == WebRemotePlaybackAvailability::kDeviceNotAvailable) {
     resolver->Reject(DOMException::Create(kNotFoundError,
@@ skipping 124 matching lines @@
 }
 
 DEFINE_TRACE_WRAPPERS(RemotePlayback) {
   for (auto callback : availability_callbacks_.Values()) {
     visitor->TraceWrappers(callback);
   }
   EventTargetWithInlineData::TraceWrappers(visitor);
 }
 
 }  // namespace blink