Merge pull request #1378 from filipe-norte-red/fix-crash-in-non-composite-gl-mode

Fix crash on shutdown in non-composited GL mode

Author: magomez

Source/WebKit/WebProcess/WebPage/WebPage.cpp

@@ -1619,10 +1619,11 @@ void WebPage::close()
 
     m_printContext = nullptr;
     m_mainFrame->coreFrame()->loader().detachFromParent();
-    m_drawingArea = nullptr;
 
     DeferredPageDestructor::createDeferredPageDestructor(WTFMove(m_page), this);
 
+    m_drawingArea = nullptr;
+
     bool isRunningModal = m_isRunningModal;
     m_isRunningModal = false;