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

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

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  *           (C) 2004 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2011 Apple Inc.
  *               All rights reserved.
  * Copyright (C) 2009 Google Inc. All rights reserved.
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved.
  *               (http://www.torchmobile.com/)
@@ skipping 1435 matching lines @@
 Color LayoutObject::SelectionForegroundColor(
     const GlobalPaintFlags global_paint_flags) const {
   return SelectionColor(CSSPropertyWebkitTextFillColor, global_paint_flags);
 }
 
 Color LayoutObject::SelectionEmphasisMarkColor(
     const GlobalPaintFlags global_paint_flags) const {
   return SelectionColor(CSSPropertyWebkitTextEmphasisColor, global_paint_flags);
 }
 
-void LayoutObject::SelectionStartEnd(int& start_pos, int& end_pos) const {
+std::pair<int, int> LayoutObject::SelectionStartEnd() const {
   DCHECK(!View()->NeedsLayout());
-  GetFrame()->Selection().LayoutSelectionStartEnd(start_pos, end_pos);
+  return GetFrame()->Selection().LayoutSelectionStartEnd();
 }
 
 // Called when an object that was floating or positioned becomes a normal flow
 // object again. We have to make sure the layout tree updates as needed to
 // accommodate the new normal flow object.
 static inline void HandleDynamicFloatPositionChange(LayoutObject* object) {
   // We have gone from not affecting the inline status of the parent flow to
   // suddenly having an impact.  See if there is a mismatch between the parent
   // flow's childrenInline() state and our state.
   object->SetInline(object->Style()->IsDisplayInlineType());
@@ skipping 2184 matching lines @@
     const blink::LayoutObject* root = object1;
     while (root->Parent())
       root = root->Parent();
     root->ShowLayoutTreeAndMark(object1, "*", object2, "-", 0);
   } else {
     WTFLogAlways("%s", "Cannot showLayoutTree. Root is (nil)");
   }
 }
 
 #endif