blink: Cleanup class forward declarations

third_party/WebKit/Source/platform/heap/Visitor.h

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 30 matching lines @@
 #include <memory>
 
 namespace blink {
 
 template <typename T>
 class GarbageCollected;
 class HeapObjectHeader;
 class InlinedGlobalMarkingVisitor;
 template <typename T>
 class TraceTrait;
-template <typename T>
-class TraceEagerlyTrait;
 class ThreadState;
 class Visitor;
 template <typename T>
 class TraceWrapperMember;
 
 // The TraceMethodDelegate is used to convert a trace method for type T to a
 // TraceCallback.  This allows us to pass a type's trace method as a parameter
 // to the PersistentNode constructor. The PersistentNode constructor needs the
 // specific trace method due an issue with the Windows compiler which
 // instantiates even unused variables. This causes problems
@@ skipping 295 matching lines @@
     return static_cast<Visitor*>(helper);
   }
 
   ThreadState* m_state;
   const MarkingMode m_markingMode;
 };
 
 }  // namespace blink
 
 #endif  // Visitor_h