Remove unnecessary ExceptionCode.h inclusion

third_party/WebKit/Source/core/timing/PerformanceObserver.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 "core/timing/PerformanceObserver.h"
 
 #include "bindings/core/v8/ExceptionState.h"
-#include "core/dom/ExceptionCode.h"
 #include "core/dom/ExecutionContext.h"
 #include "core/timing/PerformanceBase.h"
 #include "core/timing/PerformanceEntry.h"
 #include "core/timing/PerformanceObserverCallback.h"
 #include "core/timing/PerformanceObserverEntryList.h"
 #include "core/timing/PerformanceObserverInit.h"
 #include "platform/Timer.h"
 #include <algorithm>
 
 namespace blink {
@@ skipping 77 matching lines @@
 }
 
 DEFINE_TRACE(PerformanceObserver)
 {
     visitor->trace(m_callback);
     visitor->trace(m_performance);
     visitor->trace(m_performanceEntries);
 }
 
 } // namespace blink