Make textDistance() in SelectionController not to create a redundant Range object

Source/core/editing/SelectionController.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2012 Digia Plc. and/or its subsidiary(-ies)
  * Copyright (C) 2015 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:
  * 1. Redistributions of source code must retain the above copyright
@@ skipping 222 matching lines @@
     if (pos.isNotNull()) {
         newSelection = VisibleSelection(pos);
         newSelection.expandUsingGranularity(ParagraphGranularity);
     }
 
     return updateSelectionForMouseDownDispatchingSelectStart(innerNode, expandSelectionToRespectUserSelectAll(innerNode, newSelection), ParagraphGranularity);
 }
 
 static int textDistance(const Position& start, const Position& end)
 {
-    RefPtrWillBeRawPtr<Range> range = Range::create(*start.document(), start, end);
-    return TextIterator::rangeLength(range->startPosition(), range->endPosition(), true);
+    return TextIterator::rangeLength(start, end, true);
 }
 
 bool SelectionController::handleMousePressEventSingleClick(const MouseEventWithHitTestResults& event)
 {
     TRACE_EVENT0("blink", "SelectionController::handleMousePressEventSingleClick");
 
     m_frame->document()->updateLayoutIgnorePendingStylesheets();
     Node* innerNode = event.innerNode();
     if (!(innerNode && innerNode->layoutObject() && m_mouseDownMayStartSelect))
         return false;
@@ skipping 310 matching lines @@
 {
     return m_mouseDownMayStartSelect;
 }
 
 bool SelectionController::mouseDownWasSingleClickInSelection() const
 {
     return m_mouseDownWasSingleClickInSelection;
 }
 
 } // namespace blink