Explicitly dispose of async call chains.

Source/core/inspector/AsyncCallChainMap.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 AsyncCallChainMap_h
 #define AsyncCallChainMap_h
 
 #include "core/inspector/AsyncCallChain.h"
 #include "core/inspector/InspectorDebuggerAgent.h"
 #include "platform/heap/Handle.h"
 #include "wtf/HashMap.h"
 #include "wtf/PassRefPtr.h"
 #include "wtf/RefPtr.h"
 
 namespace blink {
 
 template <class K>
 class AsyncCallChainMap final {
     ALLOW_ONLY_INLINE_ALLOCATION();
 public:
     using MapType = WillBeHeapHashMap<K, RefPtrWillBeMember<AsyncCallChain>>;
     explicit AsyncCallChainMap(InspectorDebuggerAgent* debuggerAgent)
         : m_debuggerAgent(debuggerAgent)
     {
     }
 
     ~AsyncCallChainMap()
     {
-        // Verify that this object has been explicitly cleared already.
-        ASSERT(!m_debuggerAgent);
+        // Verify that this object has been explicitly disposed.
+        ASSERT(hasBeenDisposed());
     }
 
+#if ENABLE(ASSERT)
+    bool hasBeenDisposed() const
+    {
+        return !m_debuggerAgent;
+    }
+#endif
+
     void dispose()
     {
         clear();
         m_debuggerAgent = nullptr;
     }
 
     void clear()
     {
         ASSERT(m_debuggerAgent);
         for (auto it : m_asyncCallChains)
@@ skipping 32 matching lines @@
 
 private:
     RawPtrWillBeMember<InspectorDebuggerAgent> m_debuggerAgent;
     MapType m_asyncCallChains;
 };
 
 } // namespace blink
 
 
 #endif // AsyncCallChainMap_h