Remove unused (by clients) SkUnitMapper (https://codereview.chromium.org/283273002/)

include/core/SkUnitMapper.h

Index: include/core/SkUnitMapper.h
diff --git a/include/core/SkUnitMapper.h b/include/core/SkUnitMapper.h
deleted file mode 100644
index 46f6eddd709e0238b9b060d2ca6ae5da9ebe9025..0000000000000000000000000000000000000000
--- a/include/core/SkUnitMapper.h
+++ /dev/null
@@ -1,37 +0,0 @@
-
-/*
- * 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 SkUnitMapper_DEFINED
-#define SkUnitMapper_DEFINED
-
-#include "SkRefCnt.h"
-#include "SkScalar.h"
-
-#include "SkFlattenable.h"
-
-class SkUnitMapper : public SkFlattenable {
-public:
-    SK_DECLARE_INST_COUNT(SkUnitMapper)
-
-    SkUnitMapper() {}
-
-    /** Given a value in [0..0xFFFF], return a value in the same range.
-    */
-    virtual uint16_t mapUnit16(uint16_t x) = 0;
-
-    SK_DEFINE_FLATTENABLE_TYPE(SkUnitMapper)
-
-protected:
-    SkUnitMapper(SkReadBuffer& rb) : SkFlattenable(rb) {}
-
-private:
-    typedef SkFlattenable INHERITED;
-};
-
-#endif