Revert of Create SkColorSpaceXform to handle color conversions

src/core/SkColorSpaceXform.h

Index: src/core/SkColorSpaceXform.h
diff --git a/src/core/SkColorSpaceXform.h b/src/core/SkColorSpaceXform.h
deleted file mode 100644
index c3010f0ccac99c00867c4e8eea7e7ae2d3b330ce..0000000000000000000000000000000000000000
--- a/src/core/SkColorSpaceXform.h
+++ /dev/null
@@ -1,51 +0,0 @@
-/*
- * Copyright 2016 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
-
-#ifndef SkColorSpaceXform_DEFINED
-#define SkColorSpaceXform_DEFINED
-
-#include "SkColorSpace.h"
-
-class SkColorSpaceXform {
-public:
-
-    /**
-     *  Create an object to handle color space conversions.
-     *
-     *  @param srcSpace The encoded color space.
-     *  @param dstSpace The destination color space.
-     *
-     */
-    static std::unique_ptr<SkColorSpaceXform> New(const sk_sp<SkColorSpace>& srcSpace,
-                                                  const sk_sp<SkColorSpace>& dstSpace);
-
-    /**
-     *  Apply the color conversion to a src buffer, storing the output in the dst buffer.
-     *  The src is stored in RGBA_8888 and the dst is stored in 8888 platform format.
-     *  The output is not premultiplied.
-     */
-    virtual void xform_RGBA_8888(uint32_t* dst, const uint32_t* src, uint32_t len) const = 0;
-
-    virtual ~SkColorSpaceXform() {}
-};
-
-class SkGammaByValueXform : public SkColorSpaceXform {
-public:
-
-    void xform_RGBA_8888(uint32_t* dst, const uint32_t* src, uint32_t len) const override;
-
-private:
-    SkGammaByValueXform(float srcGammas[3], const SkMatrix44& srcToDst, float dstGammas[3]);
-
-    float            fSrcGammas[3];
-    const SkMatrix44 fSrcToDst;
-    float            fDstGammas[3];
-
-    friend class SkColorSpaceXform;
-};
-
-#endif