Remove scroll offset methods from WebDocument, nothing uses them.

public/web/WebDocument.h

 /*
  * 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 96 matching lines @@
     BLINK_EXPORT void images(WebVector<WebElement>&);
     BLINK_EXPORT WebURL completeURL(const WebString&) const;
     BLINK_EXPORT WebElement getElementById(const WebString&) const;
     BLINK_EXPORT WebElement focusedElement() const;
     BLINK_EXPORT WebDocumentType doctype() const;
     BLINK_EXPORT void cancelFullScreen();
     BLINK_EXPORT WebElement fullScreenElement() const;
     BLINK_EXPORT WebDOMEvent createEvent(const WebString& eventType);
     BLINK_EXPORT WebReferrerPolicy referrerPolicy() const;
     BLINK_EXPORT WebElement createElement(const WebString& tagName);
-    // Shorthand of frame()->scrollOffset().
-    BLINK_EXPORT WebSize scrollOffset() const;
-    // Shorthand of frame()->minimumScrollOffset().
-    BLINK_EXPORT WebSize minimumScrollOffset() const;
-    // Shorthand of frame()->maximumScrollOffset().
-    BLINK_EXPORT WebSize maximumScrollOffset() const;
 
     // Accessibility support. These methods should only be called on the
     // top-level document, because one accessibility cache spans all of
     // the documents on the page.
 
     // Gets the accessibility object for this document.
     BLINK_EXPORT WebAXObject accessibilityObject() const;
 
     // Gets the accessibility object for an object on this page by ID.
     BLINK_EXPORT WebAXObject accessibilityObjectFromID(int axID) const;
@@ skipping 17 matching lines @@
 #if BLINK_IMPLEMENTATION
     WebDocument(const PassRefPtrWillBeRawPtr<Document>&);
     WebDocument& operator=(const PassRefPtrWillBeRawPtr<Document>&);
     operator PassRefPtrWillBeRawPtr<Document>() const;
 #endif
 };
 
 } // namespace blink
 
 #endif