Revert of Make DOMWrapperWorld::current() return a reference instead of a pointer

Source/bindings/v8/WorkerScriptController.cpp

Index: Source/bindings/v8/WorkerScriptController.cpp
diff --git a/Source/bindings/v8/WorkerScriptController.cpp b/Source/bindings/v8/WorkerScriptController.cpp
index 6127764871bf72ad64238da0085237b601cbcfd7..c26d085a31df8a3908262a9ed2157f55dd12792e 100644
--- a/Source/bindings/v8/WorkerScriptController.cpp
+++ b/Source/bindings/v8/WorkerScriptController.cpp
@@ -211,11 +211,11 @@ void WorkerScriptController::evaluate(const ScriptSourceCode& sourceCode, RefPtr
     if (state.hadException) {
         if (errorEvent) {
             *errorEvent = m_workerGlobalScope.shouldSanitizeScriptError(state.sourceURL, NotSharableCrossOrigin) ?
-                ErrorEvent::createSanitizedError(m_world.get()) : ErrorEvent::create(state.errorMessage, state.sourceURL, state.lineNumber, state.columnNumber, m_world.get());
+                ErrorEvent::createSanitizedError(0) : ErrorEvent::create(state.errorMessage, state.sourceURL, state.lineNumber, state.columnNumber, 0);
             V8ErrorHandler::storeExceptionOnErrorEventWrapper(errorEvent->get(), state.exception.v8Value(), m_isolate);
         } else {
             ASSERT(!m_workerGlobalScope.shouldSanitizeScriptError(state.sourceURL, NotSharableCrossOrigin));
-            RefPtr<ErrorEvent> event = m_errorEventFromImportedScript ? m_errorEventFromImportedScript.release() : ErrorEvent::create(state.errorMessage, state.sourceURL, state.lineNumber, state.columnNumber, m_world.get());
+            RefPtr<ErrorEvent> event = m_errorEventFromImportedScript ? m_errorEventFromImportedScript.release() : ErrorEvent::create(state.errorMessage, state.sourceURL, state.lineNumber, state.columnNumber, 0);
             m_workerGlobalScope.reportException(event, nullptr, NotSharableCrossOrigin);
         }
     }