Remove DOMImplementation.

sky/engine/core/dom/Document.h

Index: sky/engine/core/dom/Document.h
diff --git a/sky/engine/core/dom/Document.h b/sky/engine/core/dom/Document.h
index ea4c0b85b0030ca957758a45571f2019c04f976b..86d2e56372f6a71a682f2c7fefc08bf2ba40f849 100644
--- a/sky/engine/core/dom/Document.h
+++ b/sky/engine/core/dom/Document.h
@@ -69,7 +69,6 @@ class Comment;
 class ConsoleMessage;
 class CustomElementMicrotaskRunQueue;
 class CustomElementRegistrationContext;
-class DOMImplementation;
 class DocumentFragment;
 class DocumentLifecycleNotifier;
 class DocumentLoadTiming;
@@ -177,6 +176,9 @@ public:
     }
     virtual ~Document();
 
+    // Called by JS.
+    static PassRefPtr<Document> create(Document&);
+
     MediaQueryMatcher& mediaQueryMatcher();
 
     void mediaQueryAffectingValueChanged();
@@ -205,8 +207,6 @@ public:
 
     String outgoingReferrer();
 
-    DOMImplementation& implementation();
-
     Element* documentElement() const
     {
         return m_documentElement.get();
@@ -767,8 +767,6 @@ private:
     // Mime-type of the document in case it was cloned or created by XHR.
     AtomicString m_mimeType;
 
-    OwnPtr<DOMImplementation> m_implementation;
-
     RefPtr<CSSStyleSheet> m_elemSheet;
 
     Timer<Document> m_executeScriptsWaitingForResourcesTimer;