Remove debugger id, use local frame id instead.

Source/core/inspector/PageRuntimeAgent.h

 /*
  * Copyright (C) 2011 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 38 matching lines @@
     }
     virtual ~PageRuntimeAgent();
     DECLARE_VIRTUAL_TRACE();
     virtual void init() override;
     virtual void enable(ErrorString*) override;
 
     void didClearDocumentOfWindowObject(LocalFrame*);
     void didCreateScriptContext(LocalFrame*, ScriptState*, SecurityOrigin*, int worldId);
     void willReleaseScriptContext(LocalFrame*, ScriptState*);
 
-    int debuggerId() const { return m_debuggerId; }
-
 private:
     PageRuntimeAgent(InjectedScriptManager*, Client*, V8Debugger*, InspectorPageAgent*);
 
     virtual InjectedScript injectedScriptForEval(ErrorString*, const int* executionContextId) override;
     virtual void muteConsole() override;
     virtual void unmuteConsole() override;
     void reportExecutionContextCreation();
 
     RawPtrWillBeMember<InspectorPageAgent> m_pageAgent;
     bool m_mainWorldContextCreated;
-    int m_debuggerId;
 };
 
 } // namespace blink
 
 
 #endif // !defined(InspectorPagerAgent_h)