Mine

diff --git a/WebCore/dom/Document.cpp b/WebCore/dom/Document.cpp
index 49c13bb..71f5d1d 100644
--- a/WebCore/dom/Document.cpp
+++ b/WebCore/dom/Document.cpp
@@ -491,7 +491,7 @@ inline void Document::DocumentOrderedMap::clear()
 
+    //ASSERT(!m_deletionHasBegun);
     if (m_selfOnlyRefCount) {
         // If removing a child removes the last self-only ref, we don't
         // want the document to be destructed until after
@@ -529,7 +529,7 @@ void Document::removedLastRef()
         selfOnlyDeref();
     } else {
 #ifndef NDEBUG
-        m_deletionHasBegun = true;
+        //m_deletionHasBegun = true;
 #endif
         delete this;
     }
@@ -4652,6 +4652,11 @@ static PassRefPtr<RenderStyle> cloneRenderStyleWithState(const RenderStyle* curr
     return newStyle.release();
 }
 
+static inline bool isDeletedValue(RenderStyle* style)
+{
+    return style == TextAutoSizingKey::deletedKeyStyle();
+}
+
 TextAutoSizingKey::TextAutoSizingKey()
     : m_style(0)
     , m_document(0)
@@ -4662,13 +4667,15 @@ TextAutoSizingKey::TextAutoSizingKey(RenderStyle* style, Document* document)
     : m_style(style)
     , m_document(document)
 {
+    //ASSERT(style); // Can be deleted value.
     ref();
 }
 
 TextAutoSizingKey::TextAutoSizingKey(const TextAutoSizingKey& other)
-    : m_style(other.m_style)
-    , m_document(other.m_document)
+    : m_style(other.style())
+    , m_document(other.document())
 {
+    //ASSERT(other.style()); // Can be deleted value.
     ref();
 }
 
@@ -4689,13 +4696,15 @@ TextAutoSizingKey& TextAutoSizingKey::operator=(const TextAutoSizingKey& other)
 
 void TextAutoSizingKey::ref() const
 {
-    if (style())
-        style()->ref();
+    if (isDeletedValue(style()) || !style())
+        return;
+
+    style()->ref();
 }
 
 void TextAutoSizingKey::deref() const
 {
-    if (!style())
+    if (isDeletedValue(style()) || !style())
         return;
 
     ASSERT(document() && document()->renderArena());
@@ -4885,7 +4894,7 @@ void Document::validateAutoSizingNodes()
         TextAutoSizingKey key = it->first;
         RefPtr<TextAutoSizingValue> value = it->second;
         // Update all the nodes in the collection to reflect the new candidate size.
-        if (!value)
+        if (!value) // Deleted value.
             continue;
 
         value->removeStaleNodes();
diff --git a/WebCore/dom/Document.h b/WebCore/dom/Document.h
index c888ff0..61321a0 100644
--- a/WebCore/dom/Document.h
+++ b/WebCore/dom/Document.h
@@ -199,15 +199,13 @@ public:
     TextAutoSizingKey(const TextAutoSizingKey&);
     TextAutoSizingKey& operator=(const TextAutoSizingKey&);
 
-    Document* document() const { return m_document != deletedKeyDocument() ? m_document : 0; }
-    RenderStyle* style() const { return m_style != deletedKeyStyle() ? m_style : 0; }
+    Document* document() const { return m_document; }
+    RenderStyle* style() const { return m_style; }
 
     static Document* deletedKeyDocument() { return (Document*) -1; }
     static RenderStyle* deletedKeyStyle() { return (RenderStyle*) -1; }
 
 private:
-    friend bool operator==(const TextAutoSizingKey& a, const TextAutoSizingKey& b);
-
     void ref() const;
     void deref() const;
 
@@ -217,9 +215,9 @@ private:
 
 inline bool operator==(const TextAutoSizingKey& a, const TextAutoSizingKey& b)
 {
-    if (a.style() && b.style())
+    if (a.style() && a.style() != a.deletedKeyStyle() && b.style() && b.style() != b.deletedKeyStyle())
         return a.style()->equalForTextAutosizing(b.style());
-    return a.m_style == b.m_style;
+    return a.style() == b.style();
 }
 
 struct TextAutoSizingHash {
@@ -279,16 +277,16 @@ public:
 
     void selfOnlyRef()
     {
-        ASSERT(!m_deletionHasBegun);
+    //    ASSERT(!m_deletionHasBegun);
         ++m_selfOnlyRefCount;
     }
     void selfOnlyDeref()
     {
-        ASSERT(!m_deletionHasBegun);
+        //ASSERT(!m_deletionHasBegun);
         --m_selfOnlyRefCount;
         if (!m_selfOnlyRefCount && !refCount()) {
 #ifndef NDEBUG
-            m_deletionHasBegun = true;
+            //m_deletionHasBegun = true;
 #endif
             delete this;
         }