remove unused SkFixed and SkFract functions

src/core/SkMathPriv.h

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkMathPriv_DEFINED
 #define SkMathPriv_DEFINED
 
@@ skipping 21 matching lines @@
  Note: only works as long as max - value doesn't wrap around
  @return max if value >= max, else value
  */
 static inline unsigned SkClampUMax(unsigned value, unsigned max) {
     if (value > max) {
         value = max;
     }
     return value;
 }
 
-/** Computes the 64bit product of a * b, and then shifts the answer down by
- shift bits, returning the low 32bits. shift must be [0..63]
- e.g. to perform a fixedmul, call SkMulShift(a, b, 16)
- */
-int32_t SkMulShift(int32_t a, int32_t b, unsigned shift);
-
-/** Return the integer cube root of value, with a bias of bitBias
- */
-int32_t SkCubeRootBits(int32_t value, int bitBias);
-
 ///////////////////////////////////////////////////////////////////////////////
 
 /** Return a*b/255, truncating away any fractional bits. Only valid if both
  a and b are 0..255
  */
 static inline U8CPU SkMulDiv255Trunc(U8CPU a, U8CPU b) {
     SkASSERT((uint8_t)a == a);
     SkASSERT((uint8_t)b == b);
     unsigned prod = SkMulS16(a, b) + 1;
     return (prod + (prod >> 8)) >> 8;
@@ skipping 10 matching lines @@
 }
 
 /** Just the rounding step in SkDiv255Round: round(value / 255)
  */
 static inline unsigned SkDiv255Round(unsigned prod) {
     prod += 128;
     return (prod + (prod >> 8)) >> 8;
 }
 
 #endif