Change SelectionStartEnd() returning values instead of assigning into ref args.

third_party/WebKit/Source/core/layout/LayoutObject.h

 /*
  * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
  *           (C) 2000 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  *           (C) 2004 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2012 Apple Inc.
  *               All rights reserved.
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 1526 matching lines @@
 
   // ImageResourceClient override.
   void ImageChanged(ImageResourceContent*, const IntRect* = nullptr) final;
   bool WillRenderImage() final;
   bool GetImageAnimationPolicy(ImageAnimationPolicy&) final;
 
   // Sub-classes that have an associated image need to override this function
   // to get notified of any image change.
   virtual void ImageChanged(WrappedImagePtr, const IntRect* = nullptr) {}
 
-  void SelectionStartEnd(int& spos, int& epos) const;
+  std::pair<int, int> SelectionStartEnd() const;
 
   void Remove() {
     if (Parent())
       Parent()->RemoveChild(this);
   }
 
   bool VisibleToHitTestRequest(const HitTestRequest& request) const {
     return Style()->Visibility() == EVisibility::kVisible &&
            (request.IgnorePointerEventsNone() ||
             Style()->PointerEvents() != EPointerEvents::kNone) &&
@@ skipping 1265 matching lines @@
 CORE_EXPORT void showLineTree(const blink::LayoutObject*);
 CORE_EXPORT void showLayoutTree(const blink::LayoutObject* object1);
 // We don't make object2 an optional parameter so that showLayoutTree
 // can be called from gdb easily.
 CORE_EXPORT void showLayoutTree(const blink::LayoutObject* object1,
                                 const blink::LayoutObject* object2);
 
 #endif
 
 #endif  // LayoutObject_h