Don't expose DocumentWriter to embedding layer

Source/core/loader/DocumentLoader.h

Index: Source/core/loader/DocumentLoader.h
diff --git a/Source/core/loader/DocumentLoader.h b/Source/core/loader/DocumentLoader.h
index b92864b954946121f9f8205bee095793abc05a2e..8b11120aabe0599f2c4c9470b7f71687990081bb 100644
--- a/Source/core/loader/DocumentLoader.h
+++ b/Source/core/loader/DocumentLoader.h
@@ -80,8 +80,6 @@ namespace WebCore {
         unsigned long mainResourceIdentifier() const;
 
         void replaceDocument(const String& source, Document*);
-        DocumentWriter* beginWriting(const AtomicString& mimeType, const AtomicString& encoding, const KURL& = KURL());
-        void endWriting(DocumentWriter*);
 
         const AtomicString& mimeType() const;
 
@@ -164,11 +162,10 @@ namespace WebCore {
 
         void ensureWriter();
         void ensureWriter(const AtomicString& mimeType, const KURL& overridingURL = KURL());
+        void endWriting(DocumentWriter*);
 
         Document* document() const;
 
-        void setRequest(const ResourceRequest&);
-
         void commitIfReady();
         void commitData(const char* bytes, size_t length);
         void setMainDocumentError(const ResourceError&);