[inspector] support setTimeout in Debugger.scheduleStepIntoAsync method

src/inspector/v8-debugger-agent-impl.h

 // Copyright 2015 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_V8DEBUGGERAGENTIMPL_H_
 #define V8_INSPECTOR_V8DEBUGGERAGENTIMPL_H_
 
 #include <vector>
 
 #include "src/base/macros.h"
@@ skipping 125 matching lines @@
   void didParseSource(std::unique_ptr<V8DebuggerScript>, bool success);
 
   bool isFunctionBlackboxed(const String16& scriptId,
                             const v8::debug::Location& start,
                             const v8::debug::Location& end);
 
   bool skipAllPauses() const { return m_skipAllPauses; }
 
   v8::Isolate* isolate() { return m_isolate; }
 
-  bool shouldBreakInScheduledAsyncTask();
-
  private:
   void enableImpl();
 
   Response currentCallFrames(
       std::unique_ptr<protocol::Array<protocol::Debugger::CallFrame>>*);
   std::unique_ptr<protocol::Runtime::StackTrace> currentAsyncStackTrace();
 
   void setPauseOnExceptionsImpl(int);
 
   std::unique_ptr<protocol::Debugger::Location> resolveBreakpoint(
@@ skipping 39 matching lines @@
       const String16& breakReason,
       std::unique_ptr<protocol::DictionaryValue> breakAuxData);
   void popBreakDetails();
 
   bool m_skipAllPauses = false;
 
   std::unique_ptr<V8Regex> m_blackboxPattern;
   protocol::HashMap<String16, std::vector<std::pair<int, int>>>
       m_blackboxedPositions;
 
-  std::unique_ptr<ScheduleStepIntoAsyncCallback> m_stepIntoAsyncCallback;
-
   DISALLOW_COPY_AND_ASSIGN(V8DebuggerAgentImpl);
 };
 
 }  // namespace v8_inspector
 
 #endif  // V8_INSPECTOR_V8DEBUGGERAGENTIMPL_H_