Use std::isnan instead of isnan in global ns

third_party/WebKit/Source/platform/PlatformTouchPoint.h

 /*
     Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies)
 
     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.
 
     This library is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 31 matching lines @@
     {
     }
 
     const WebPointerProperties& pointerProperties() const { return m_pointerProperties; }
     int id() const { return pointerProperties().id; }
     State state() const { return m_state; }
     FloatPoint screenPos() const { return m_screenPos; }
     FloatPoint pos() const { return m_pos; }
     FloatSize radius() const { return m_radius; }
     float rotationAngle() const { return m_rotationAngle; }
-    float force() const { ASSERT(!isnan(pointerProperties().force)); return pointerProperties().force; }
+    float force() const { ASSERT(!std::isnan(pointerProperties().force)); return pointerProperties().force; }
 
 protected:
     WebPointerProperties m_pointerProperties;
 
     State m_state;
     FloatPoint m_screenPos;
     FloatPoint m_pos;
     FloatSize m_radius;
     float m_rotationAngle;
 };
 
 } // namespace blink
 
 #endif // PlatformTouchPoint_h