remove SkScalarCompare type and header

include/core/SkScalarCompare.h

-
-/*
- * Copyright 2006 The Android Open Source Project
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
-
-
-#ifndef SkScalarCompare_DEFINED
-#define SkScalarCompare_DEFINED
-
-#include "SkFloatBits.h"
-#include "SkRect.h"
-
-/** Skia can spend a lot of time just comparing scalars (e.g. quickReject).
-    When scalar==fixed, this is very fast, and when scalar==hardware-float, this
-    is also reasonable, but if scalar==software-float, then each compare can be
-    a function call and take real time. To account for that, we have the flag
-    SK_SCALAR_SLOW_COMPARES.
-
-    If this is defined, we have a special trick where we quickly convert floats
-    to a 2's compliment form, and then treat them as signed 32bit integers. In
-    this form we lose a few subtlties (e.g. NaNs always comparing false) but
-    we gain the speed of integer compares.
- */
-
-#ifdef SK_SCALAR_SLOW_COMPARES
-    typedef int32_t SkScalarCompareType;
-    typedef SkIRect SkRectCompareType;
-    #define SkScalarToCompareType(x)    SkScalarAs2sCompliment(x)
-#else
-    typedef SkScalar SkScalarCompareType;
-    typedef SkRect SkRectCompareType;
-    #define SkScalarToCompareType(x)    (x)
-#endif
-
-#endif