remove some pre vs2013 code

Source/wtf/MathExtras.h

Index: Source/wtf/MathExtras.h
diff --git a/Source/wtf/MathExtras.h b/Source/wtf/MathExtras.h
index e95702d2f18fa7431e0d8983580157763db794d6..835f9c986cfa7d8829e5ab4fe7aed68869e1b9b5 100644
--- a/Source/wtf/MathExtras.h
+++ b/Source/wtf/MathExtras.h
@@ -68,31 +68,6 @@ inline bool signbit(double x) { struct ieee_double *p = (struct ieee_double *)&x
 
 #endif
 
-#if COMPILER(MSVC) && (_MSC_VER < 1800)
-
-// We must not do 'num + 0.5' or 'num - 0.5' because they can cause precision loss.
-static double round(double num)
-{
-    double integer = ceil(num);
-    if (num > 0)
-        return integer - num > 0.5 ? integer - 1.0 : integer;
-    return integer - num >= 0.5 ? integer - 1.0 : integer;
-}
-static float roundf(float num)
-{
-    float integer = ceilf(num);
-    if (num > 0)
-        return integer - num > 0.5f ? integer - 1.0f : integer;
-    return integer - num >= 0.5f ? integer - 1.0f : integer;
-}
-inline long long llround(double num) { return static_cast<long long>(round(num)); }
-inline long long llroundf(float num) { return static_cast<long long>(roundf(num)); }
-inline long lround(double num) { return static_cast<long>(round(num)); }
-inline long lroundf(float num) { return static_cast<long>(roundf(num)); }
-inline double trunc(double num) { return num > 0 ? floor(num) : ceil(num); }
-
-#endif
-
 #if OS(ANDROID) || COMPILER(MSVC)
 // ANDROID and MSVC's math.h does not currently supply log2 or log2f.
 inline double log2(double num)
@@ -113,24 +88,6 @@ inline float log2f(float num)
 // VS2013 has most of the math functions now, but we still need to work
 // around various differences in behavior of Inf.
 
-#if _MSC_VER < 1800
-
-namespace std {
-
-inline bool isinf(double num) { return !_finite(num) && !_isnan(num); }
-inline bool isnan(double num) { return !!_isnan(num); }
-inline bool isfinite(double x) { return _finite(x); }
-inline bool signbit(double num) { return _copysign(1.0, num) < 0; }
-
-} // namespace std
-
-inline double nextafter(double x, double y) { return _nextafter(x, y); }
-inline float nextafterf(float x, float y) { return x > y ? x - FLT_EPSILON : x + FLT_EPSILON; }
-
-inline double copysign(double x, double y) { return _copysign(x, y); }
-
-#endif // _MSC_VER
-
 // Work around a bug in Win, where atan2(+-infinity, +-infinity) yields NaN instead of specific values.
 inline double wtf_atan2(double x, double y)
 {
@@ -164,32 +121,6 @@ inline double wtf_pow(double x, double y) { return y == 0 ? 1 : pow(x, y); }
 #define fmod(x, y) wtf_fmod(x, y)
 #define pow(x, y) wtf_pow(x, y)
 
-#if _MSC_VER < 1800
-
-// MSVC's math functions do not bring lrint.
-inline long int lrint(double flt)
-{
-    int64_t intgr;
-#if CPU(X86)
-    __asm {
-        fld flt
-        fistp intgr
-    };
-#else
-    ASSERT(std::isfinite(flt));
-    double rounded = round(flt);
-    intgr = static_cast<int64_t>(rounded);
-    // If the fractional part is exactly 0.5, we need to check whether
-    // the rounded result is even. If it is not we need to add 1 to
-    // negative values and subtract one from positive values.
-    if ((fabs(intgr - flt) == 0.5) & intgr)
-        intgr -= ((intgr >> 62) | 1); // 1 with the sign of result, i.e. -1 or 1.
-#endif
-    return static_cast<long int>(intgr);
-}
-
-#endif // _MSC_VER
-
 #endif // COMPILER(MSVC)
 
 inline double deg2rad(double d)  { return d * piDouble / 180.0; }