Reapply the non-MathExtras parts of

Source/core/css/resolver/TransformBuilder.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 2004-2005 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2006, 2007 Nicholas Shanks (webkit@nickshanks.com)
  * Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Alexey Proskuryakov <ap@webkit.org>
  * Copyright (C) 2007, 2008 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (c) 2011, Code Aurora Forum. All rights reserved.
  * Copyright (C) Research In Motion Limited 2011. All rights reserved.
@@ skipping 283 matching lines @@
         }
         case CSSTransformValue::PerspectiveTransformOperation: {
             double p;
             if (firstValue->isLength())
                 p = firstValue->computeLength<double>(conversionData);
             else {
                 // This is a quirk that should go away when 3d transforms are finalized.
                 double val = firstValue->getDoubleValue();
                 if (val < 0)
                     return false;
-                p = clampToPositiveInteger(val);
+                p = clampTo<int>(val, 0);
             }
 
             operations.operations().append(PerspectiveTransformOperation::create(p));
             break;
         }
         case CSSTransformValue::UnknownTransformOperation:
             ASSERT_NOT_REACHED();
             break;
         }
     }
 
     outOperations = operations;
     return true;
 }
 
 } // namespace blink