include RefCounted.h where needed, only.

third_party/WebKit/Source/core/timing/PerformanceObserverEntryList.h

 // 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.
 
 #ifndef PerformanceObserverEntryList_h
 #define PerformanceObserverEntryList_h
 
 #include "bindings/core/v8/ScriptWrappable.h"
 #include "platform/heap/Handle.h"
-#include "wtf/PassRefPtr.h"
-#include "wtf/RefCounted.h"
-#include "wtf/text/WTFString.h"
+#include "wtf/Forward.h"
 
 namespace blink {
 
 class PerformanceEntry;
 using PerformanceEntryVector = HeapVector<Member<PerformanceEntry>>;
 
 class PerformanceObserverEntryList : public GarbageCollectedFinalized<PerformanceObserverEntryList>, public ScriptWrappable {
     DEFINE_WRAPPERTYPEINFO();
 public:
     PerformanceObserverEntryList(const PerformanceEntryVector&);
 
     virtual ~PerformanceObserverEntryList();
 
     PerformanceEntryVector getEntries() const;
     PerformanceEntryVector getEntriesByType(const String& entryType);
     PerformanceEntryVector getEntriesByName(const String& name, const String& entryType);
 
     DECLARE_TRACE();
 
 protected:
     PerformanceEntryVector m_performanceEntries;
 };
 
 } // namespace blink
 
 #endif // PerformanceObserverEntryList_h