Bug 753665 - Ensure the mParent reference is nulled out when destroying a child window. r=blassey

widget/android/nsWindow.cpp

@@ -250,8 +250,7 @@ nsWindow::Destroy(void)
     if (IsTopLevel())
         gTopLevelWindows.RemoveElement(this);
 
-    if (mParent)
-        mParent->mChildren.RemoveElement(this);
+    SetParent(nsnull);
 
     nsBaseWidget::OnDestroy();