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

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

 /*
  * Copyright (C) 2004, 2008, 2009, 2010 Apple 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 1146 matching lines @@
 }
 
 Range* FrameSelection::DocumentCachedRange() const {
   return selection_editor_->DocumentCachedRange();
 }
 
 void FrameSelection::ClearDocumentCachedRange() {
   selection_editor_->ClearDocumentCachedRange();
 }
 
-void FrameSelection::LayoutSelectionStartEnd(int& start_pos, int& end_pos) {
-  layout_selection_->SelectionStartEnd(start_pos, end_pos);
+std::pair<int, int> FrameSelection::LayoutSelectionStartEnd() {
+  return layout_selection_->SelectionStartEnd();
 }
 
 void FrameSelection::ClearLayoutSelection() {
   layout_selection_->ClearSelection();
 }
 
 }  // namespace blink
 
 #ifndef NDEBUG
 
 void showTree(const blink::FrameSelection& sel) {
   sel.ShowTreeForThis();
 }
 
 void showTree(const blink::FrameSelection* sel) {
   if (sel)
     sel->ShowTreeForThis();
   else
     LOG(INFO) << "Cannot showTree for <null> FrameSelection.";
 }
 
 #endif