Remove wtf_ceil.

Source/wtf/MathExtras.h

Index: Source/wtf/MathExtras.h
diff --git a/Source/wtf/MathExtras.h b/Source/wtf/MathExtras.h
index 5925ca5e89a1d96dfb6fa34b9908ce9d10ee32f2..7e91e8e88bdff514b31b7969e30e6234fee87a75 100644
--- a/Source/wtf/MathExtras.h
+++ b/Source/wtf/MathExtras.h
@@ -52,15 +52,6 @@ const float piOverFourFloat = static_cast<float>(M_PI_4);
 const double twoPiDouble = piDouble * 2.0;
 const float twoPiFloat = piFloat * 2.0f;
 
-#if OS(MACOSX)
-
-// Work around a bug in the Mac OS X libc where ceil(-0.1) return +0.
-inline double wtf_ceil(double x) { return copysign(ceil(x), x); }
-
-#define ceil(x) wtf_ceil(x)
-
-#endif
-
 #if OS(OPENBSD)
 
 namespace std {