DevTools: speculative fix of crash in PageDebuggerAgent::restore

Source/core/inspector/PageDebuggerAgent.h

Index: Source/core/inspector/PageDebuggerAgent.h
diff --git a/Source/core/inspector/PageDebuggerAgent.h b/Source/core/inspector/PageDebuggerAgent.h
index 4c8097e7bb88618e0c2a07c5fdc45e0f9a0e0962..35500481cdb7f153cc54101b317ca31818b6c912 100644
--- a/Source/core/inspector/PageDebuggerAgent.h
+++ b/Source/core/inspector/PageDebuggerAgent.h
@@ -58,6 +58,7 @@ public:
     DECLARE_VIRTUAL_TRACE();
 
     void enable(ErrorString*) final;
+    void restore() final;
     void compileScript(ErrorString*, const String& expression, const String& sourceURL, bool persistScript, const int* executionContextId, TypeBuilder::OptOutput<TypeBuilder::Debugger::ScriptId>*, RefPtr<TypeBuilder::Debugger::ExceptionDetails>&) override;
     void runScript(ErrorString*, const TypeBuilder::Debugger::ScriptId&, const int* executionContextId, const String* objectGroup, const bool* doNotPauseOnExceptionsAndMuteConsole, RefPtr<TypeBuilder::Runtime::RemoteObject>& result, RefPtr<TypeBuilder::Debugger::ExceptionDetails>&) override;