Revert of replace SkFixedDiv impl with native 64bit math

bench/MathBench.cpp

 #include "Benchmark.h"
 #include "SkColorPriv.h"
 #include "SkMatrix.h"
 #include "SkPaint.h"
 #include "SkRandom.h"
 #include "SkString.h"
 
 static float sk_fsel(float pred, float result_ge, float result_lt) {
     return pred >= 0 ? result_ge : result_lt;
 }
@@ skipping 527 matching lines @@
     virtual const char* onGetName() {
         return "float_to_fixed";
     }
 
 private:
     typedef Benchmark INHERITED;
 };
 
 ///////////////////////////////////////////////////////////////////////////////
 
-class DivBitsBench : public Benchmark {
-protected:
-    enum {
-        N = 1000
-    };
-    volatile int32_t fSrc[N], fDst[N];
-public:
-    DivBitsBench() {
-        SkRandom rand;
-        for (int i = 0; i < N; ++i) {
-            fSrc[i] = rand.nextU();
-        }
-    }
-protected:
-    virtual void onDraw(const int loops, SkCanvas*) {
-        for (int j = 0; j < loops; ++j) {
-            for (int i = 0; i < N - 4; ++i) {
-                fDst[i] = SkDivBits(fSrc[i], fSrc[i] >> 3, 16);
-            }
-        }
-    }
-    virtual const char* onGetName() {
-        return "divbits";
-    }
-};
-DEF_BENCH( return new DivBitsBench; )
-
-class FixedDivBench : public DivBitsBench {
-protected:
-    virtual void onDraw(const int loops, SkCanvas*) {
-        for (int j = 0; j < loops; ++j) {
-            for (int i = 0; i < N - 4; ++i) {
-                fDst[i] = SkFixedDiv(fSrc[i], fSrc[i] >> 3);
-            }
-        }
-    }
-    virtual const char* onGetName() {
-        return "fixeddiv";
-    }
-};
-DEF_BENCH( return new FixedDivBench; )
-
-///////////////////////////////////////////////////////////////////////////////
-
 template <typename T>
 class DivModBench : public Benchmark {
     SkString fName;
 public:
     explicit DivModBench(const char* name) {
         fName.printf("divmod_%s", name);
     }
 
     bool isSuitableFor(Backend backend) SK_OVERRIDE {
         return backend == kNonRendering_Backend;
@@ skipping 44 matching lines @@
 
 DEF_BENCH( return new FloorBench(false); )
 DEF_BENCH( return new FloorBench(true); )
 
 DEF_BENCH( return new CLZBench(false); )
 DEF_BENCH( return new CLZBench(true); )
 
 DEF_BENCH( return new NormalizeBench(); )
 
 DEF_BENCH( return new FixedMathBench(); )