Merge 104845 - REGRESSION(r104060): Setting user stylesheet may leave CSSStyleSelector with stale...

Source/WebCore/dom/Document.cpp

Index: Source/WebCore/dom/Document.cpp
===================================================================
--- Source/WebCore/dom/Document.cpp	(revision 105785)
+++ Source/WebCore/dom/Document.cpp	(working copy)
@@ -2958,8 +2958,10 @@
 {
     // Don't bother updating, since we haven't loaded all our style info yet
     // and haven't calculated the style selector for the first time.
-    if (!attached() || (!m_didCalculateStyleSelector && !haveStylesheetsLoaded()))
+    if (!attached() || (!m_didCalculateStyleSelector && !haveStylesheetsLoaded())) {
+        m_styleSelector.clear();
         return;
+    }
 
 #ifdef INSTRUMENT_LAYOUT_SCHEDULING
     if (!ownerElement())