blink: Cleanup class forward declarations

third_party/WebKit/Source/core/inspector/InspectorWebPerfAgent.h

 // 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.
 
 #ifndef InspectorWebPerfAgent_h
 #define InspectorWebPerfAgent_h
 
 #include "core/CoreExport.h"
 #include "platform/heap/Handle.h"
 #include "public/platform/WebThread.h"
 #include "public/platform/scheduler/base/task_time_observer.h"
 
 namespace blink {
 
 class DOMWindow;
 class ExecutionContext;
 class Frame;
 class LocalFrame;
-class Location;
 class Performance;
 
 // Inspector Agent for Web Performance APIs
 // The agent is maintained per local root.
 // Long task notifications are delivered to observing Performance* instances
 // (in the local frame tree) in m_webPerformanceObservers.
 //
 // Usage:
 // To create agent:
 //     - instantiate and enable the agent:
@@ skipping 57 matching lines @@
       Frame* observerFrame);
 
   Member<LocalFrame> m_localRoot;
   HeapHashSet<Member<Frame>> m_frameContexts;
   HeapHashSet<Member<Performance>> m_webPerformanceObservers;
 };
 
 }  // namespace blink
 
 #endif  // InspectorWebPerfAgent_h