Remove unnecessary ExceptionCode.h inclusion

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

 // Copyright 2015 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/VRHardwareUnitCollection.h"
 
 #include "bindings/core/v8/ScriptPromiseResolver.h"
 #include "core/dom/Document.h"
-#include "core/dom/ExceptionCode.h"
 #include "core/frame/LocalDOMWindow.h"
 #include "core/frame/LocalFrame.h"
 #include "core/frame/Navigator.h"
 #include "core/page/Page.h"
 #include "modules/vr/HMDVRDevice.h"
 #include "modules/vr/NavigatorVRDevice.h"
 #include "modules/vr/PositionSensorVRDevice.h"
 #include "modules/vr/VRController.h"
 #include "modules/vr/VRGetDevicesCallback.h"
 #include "modules/vr/VRHardwareUnit.h"
@@ skipping 37 matching lines @@
     return 0;
 }
 
 DEFINE_TRACE(VRHardwareUnitCollection)
 {
     visitor->trace(m_navigatorVRDevice);
     visitor->trace(m_hardwareUnits);
 }
 
 } // namespace blink