Store nonAttachedStyle on NodeLayoutData instead of on HashMap in Document.

third_party/WebKit/Source/core/dom/Document.h

Index: third_party/WebKit/Source/core/dom/Document.h
diff --git a/third_party/WebKit/Source/core/dom/Document.h b/third_party/WebKit/Source/core/dom/Document.h
index 5478be0cd969217b3f8a38bb51aec88ca25237df..eaef989be935740987699c64d2e9a7fb4018a28f 100644
--- a/third_party/WebKit/Source/core/dom/Document.h
+++ b/third_party/WebKit/Source/core/dom/Document.h
@@ -345,9 +345,6 @@ class CORE_EXPORT Document : public ContainerNode,
   // just for the web IDL implementation.
   Element* ScrollingElementNoLayout();
 
-  void AddNonAttachedStyle(const Node&, RefPtr<ComputedStyle>);
-  ComputedStyle* GetNonAttachedStyle(const Node&) const;
-
   String readyState() const;
 
   AtomicString characterSet() const { return Document::EncodingName(); }
@@ -1449,10 +1446,6 @@ class CORE_EXPORT Document : public ContainerNode,
   Member<DocumentParser> parser_;
   Member<ContextFeatures> context_features_;
 
-  // This HashMap is used to temporaily store the ComputedStyle generated in the
-  // Style Resolution phase which is used in the Layout Tree construction phase.
-  HeapHashMap<Member<const Node>, RefPtr<ComputedStyle>> non_attached_style_;
-
   bool well_formed_;
 
   // Document URLs.