Chromium roll (https://codereview.chromium.org/976353002)

tools/clang/blink_gc_plugin/Edge.h

 // Copyright 2014 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 TOOLS_BLINK_GC_PLUGIN_EDGE_H_
 #define TOOLS_BLINK_GC_PLUGIN_EDGE_H_
 
 #include <deque>
 
 #include "TracingStatus.h"
 
 class RecordInfo;
 
 class Edge;
 class Value;
 class RawPtr;
 class RefPtr;
 class OwnPtr;
 class Member;
 class WeakMember;
 class Persistent;
 class Collection;
 
 // Bare-bones visitor.
 class EdgeVisitor {
  public:
+  virtual ~EdgeVisitor() {}
   virtual void VisitValue(Value*) {}
   virtual void VisitRawPtr(RawPtr*) {}
   virtual void VisitRefPtr(RefPtr*) {}
   virtual void VisitOwnPtr(OwnPtr*) {}
   virtual void VisitMember(Member*) {}
   virtual void VisitWeakMember(WeakMember*) {}
   virtual void VisitPersistent(Persistent*) {}
   virtual void VisitCollection(Collection*) {}
 };
 
@@ skipping 199 matching lines @@
   }
 
  private:
   RecordInfo* info_;
   Members members_;
   bool on_heap_;
   bool is_root_;
 };
 
 #endif  // TOOLS_BLINK_GC_PLUGIN_EDGE_H_