DevTools: speculative fix of crash in PageDebuggerAgent::restore

Source/core/inspector/InspectorDebuggerAgent.h

 /*
  * Copyright (C) 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2010-2011 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:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 68 matching lines @@
         MonitorCommandBreakpointSource
     };
 
     static const char backtraceObjectGroup[];
 
     ~InspectorDebuggerAgent() override;
     DECLARE_VIRTUAL_TRACE();
 
     void canSetScriptSource(ErrorString*, bool* result) final { *result = true; }
 
-    void init() override final;
-    void restore() override final;
-    void disable(ErrorString*) override final;
+    void init() final;
+    void restore() override;
+    void disable(ErrorString*) final;
 
     bool isPaused();
     void addMessageToConsole(ConsoleMessage*);
 
     // Part of the protocol.
     void enable(ErrorString*) override;
     void setBreakpointsActive(ErrorString*, bool active) final;
     void setSkipAllPauses(ErrorString*, bool skipped) final;
 
     void setBreakpointByUrl(ErrorString*, int lineNumber, const String* optionalURL, const String* optionalURLRegex, const int* optionalColumnNumber, const String* optionalCondition, TypeBuilder::Debugger::BreakpointId*, RefPtr<TypeBuilder::Array<TypeBuilder::Debugger::Location> >& locations) final;
@@ skipping 205 matching lines @@
     bool m_pendingTraceAsyncOperationCompleted;
     bool m_startingStepIntoAsync;
     WillBeHeapVector<RawPtrWillBeMember<AsyncCallTrackingListener>> m_asyncCallTrackingListeners;
     V8GlobalValueMap<String, v8::Script, v8::kNotWeak> m_compiledScripts;
 };
 
 } // namespace blink
 
 
 #endif // InspectorDebuggerAgent_h