XMLSerializer escapes < > & correctly inside <script> and <style> tags.

Source/core/editing/MarkupAccumulator.cpp

Index: Source/core/editing/MarkupAccumulator.cpp
diff --git a/Source/core/editing/MarkupAccumulator.cpp b/Source/core/editing/MarkupAccumulator.cpp
index 1ccbc83f7694b02468b203c8a766b579e1184058..4411ed8104cea3c54559c7848f3eacbff712a1a8 100644
--- a/Source/core/editing/MarkupAccumulator.cpp
+++ b/Source/core/editing/MarkupAccumulator.cpp
@@ -303,14 +303,16 @@ void MarkupAccumulator::appendNamespace(StringBuilder& result, const AtomicStrin
 
 EntityMask MarkupAccumulator::entityMaskForText(Text* text) const
 {
+    if (!text->document().isHTMLDocument())
+        return EntityMaskInPCDATA;
+
     const QualifiedName* parentName = 0;
     if (text->parentElement())
         parentName = &(text->parentElement())->tagQName();
 
     if (parentName && (*parentName == scriptTag || *parentName == styleTag || *parentName == xmpTag))
         return EntityMaskInCDATA;
-
-    return text->document().isHTMLDocument() ? EntityMaskInHTMLPCDATA : EntityMaskInPCDATA;
+    return EntityMaskInHTMLPCDATA;
 }
 
 void MarkupAccumulator::appendText(StringBuilder& result, Text* text)