[inspector] collect old async stack traces 20% faster

src/inspector/v8-debugger.h

 // Copyright 2016 the V8 project 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 V8_INSPECTOR_V8DEBUGGER_H_
 #define V8_INSPECTOR_V8DEBUGGER_H_
 
 #include <list>
 #include <vector>
 
@@ skipping 182 matching lines @@
   protocol::HashMap<void*, void*> m_parentTask;
 
   int m_maxAsyncCallStacks;
   int m_maxAsyncCallStackDepth;
 
   std::vector<void*> m_currentTasks;
   std::vector<std::shared_ptr<AsyncStackTrace>> m_currentAsyncParent;
   std::vector<std::shared_ptr<AsyncStackTrace>> m_currentAsyncCreation;
 
   void collectOldAsyncStacksIfNeeded();
-  void removeOldAsyncTasks(AsyncTaskToStackTrace& map);
   int m_asyncStacksCount = 0;
   // V8Debugger owns all the async stacks, while most of the other references
   // are weak, which allows to collect some stacks when there are too many.
   std::list<std::shared_ptr<AsyncStackTrace>> m_allAsyncStacks;
   std::map<int, std::weak_ptr<StackFrame>> m_framesCache;
 
   protocol::HashMap<V8DebuggerAgentImpl*, int> m_maxAsyncCallStackDepthMap;
   void* m_taskWithScheduledBreak = nullptr;
 
   std::unique_ptr<ScheduleStepIntoAsyncCallback> m_stepIntoAsyncCallback;
   bool m_breakRequested = false;
 
   v8::debug::ExceptionBreakState m_pauseOnExceptionsState;
 
   WasmTranslation m_wasmTranslation;
 
   DISALLOW_COPY_AND_ASSIGN(V8Debugger);
 };
 
 }  // namespace v8_inspector
 
 #endif  // V8_INSPECTOR_V8DEBUGGER_H_