Remove scroll offset methods from WebDocument, nothing uses them.

Source/web/WebDocument.cpp

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 264 matching lines @@
 
 WebElement WebDocument::createElement(const WebString& tagName)
 {
     TrackExceptionState exceptionState;
     WebElement element(unwrap<Document>()->createElement(tagName, exceptionState));
     if (exceptionState.hadException())
         return WebElement();
     return element;
 }
 
-WebSize WebDocument::scrollOffset() const
-{
-    if (FrameView* view = constUnwrap<Document>()->view())
-        return view->scrollOffset();
-    return WebSize();
-}
-
-WebSize WebDocument::minimumScrollOffset() const
-{
-    if (FrameView* view = constUnwrap<Document>()->view())
-        return toIntSize(view->minimumScrollPosition());
-    return WebSize();
-}
-
-WebSize WebDocument::maximumScrollOffset() const
-{
-    if (FrameView* view = constUnwrap<Document>()->view())
-        return toIntSize(view->maximumScrollPosition());
-    return WebSize();
-}
-
 WebAXObject WebDocument::accessibilityObject() const
 {
     const Document* document = constUnwrap<Document>();
     AXObjectCacheImpl* cache = toAXObjectCacheImpl(document->axObjectCache());
     return cache ? WebAXObject(cache->getOrCreate(document->layoutView())) : WebAXObject();
 }
 
 WebAXObject WebDocument::accessibilityObjectFromID(int axID) const
 {
     const Document* document = constUnwrap<Document>();
@@ skipping 70 matching lines @@
     m_private = elem;
     return *this;
 }
 
 WebDocument::operator PassRefPtrWillBeRawPtr<Document>() const
 {
     return toDocument(m_private.get());
 }
 
 } // namespace blink