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

third_party/WebKit/Source/core/editing/LayoutSelection.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights
  * reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 288 matching lines @@
   }
 
   // Any new blocks that remain were not found in the old blocks dict, and so
   // they need to be updated.
   SelectedBlockMap::iterator new_blocks_end = new_selected_blocks.end();
   for (SelectedBlockMap::iterator i = new_selected_blocks.begin();
        i != new_blocks_end; ++i)
     i->key->SetShouldInvalidateSelection();
 }
 
-void LayoutSelection::SelectionStartEnd(int& start_pos, int& end_pos) {
+std::pair<int, int> LayoutSelection::SelectionStartEnd() {
   Commit();
-  start_pos = selection_start_pos_;
-  end_pos = selection_end_pos_;
+  return std::make_pair(selection_start_pos_, selection_end_pos_);
 }
 
 void LayoutSelection::ClearSelection() {
   // For querying Layer::compositingState()
   // This is correct, since destroying layout objects needs to cause eager paint
   // invalidations.
   DisableCompositingQueryAsserts disabler;
 
   SetSelection(0, -1, 0, -1, kPaintInvalidationNewMinusOld);
 }
@@ skipping 124 matching lines @@
 
     o->SetShouldInvalidateSelection();
   }
 }
 
 DEFINE_TRACE(LayoutSelection) {
   visitor->Trace(frame_selection_);
 }
 
 }  // namespace blink