qt, refactor: Drop intermediate BitcoinApplication::shutdownResult slot

src/qt/bitcoin.cpp

@@ -297,7 +297,7 @@ void BitcoinApplication::startThread()
 
     /*  communication to and from thread */
     connect(&m_executor.value(), &InitExecutor::initializeResult, this, &BitcoinApplication::initializeResult);
-    connect(&m_executor.value(), &InitExecutor::shutdownResult, this, &BitcoinApplication::shutdownResult);
+    connect(&m_executor.value(), &InitExecutor::shutdownResult, this, &QCoreApplication::quit);
     connect(&m_executor.value(), &InitExecutor::runawayException, this, &BitcoinApplication::handleRunawayException);
     connect(this, &BitcoinApplication::requestedInitialize, &m_executor.value(), &InitExecutor::initialize);
     connect(this, &BitcoinApplication::requestedShutdown, &m_executor.value(), &InitExecutor::shutdown);
@@ -418,11 +418,6 @@ void BitcoinApplication::initializeResult(bool success, interfaces::BlockAndHead
     }
 }
 
-void BitcoinApplication::shutdownResult()
-{
-    quit();
-}
-
 void BitcoinApplication::handleRunawayException(const QString &message)
 {
     QMessageBox::critical(

src/qt/bitcoin.h

@@ -73,7 +73,6 @@ public Q_SLOTS:
     void initializeResult(bool success, interfaces::BlockAndHeaderTipInfo tip_info);
     /// Request core shutdown
     void requestShutdown();
-    void shutdownResult();
     /// Handle runaway exceptions. Shows a message box with the problem and quits the program.
     void handleRunawayException(const QString &message);