Delete deprecated GammaNamed

include/core/SkColorSpace.h

 /*
  * 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 SkColorSpace_DEFINED
 #define SkColorSpace_DEFINED
 
@@ skipping 23 matching lines @@
     };
 
     enum RenderTargetGamma : uint8_t {
         kLinear_RenderTargetGamma,
 
         /**
          *  Transfer function is the canonical sRGB curve, which has a short linear segment
          *  followed by a 2.4f exponential.
          */
         kSRGB_RenderTargetGamma,
-
-        // DO NOT USE: Being deleted.
-        kLinear_GammaNamed = kLinear_RenderTargetGamma,
     };
 
     /**
      *  Create an SkColorSpace from a transfer function and a color gamut transform to D50 XYZ.
      */
     static sk_sp<SkColorSpace> NewRGB(RenderTargetGamma gamma, const SkMatrix44& toXYZD50);
 
     /**
      *  Create a common, named SkColorSpace.
      */
@@ skipping 44 matching lines @@
      */
     static bool Equals(const SkColorSpace* src, const SkColorSpace* dst);
 
 protected:
     SkColorSpace(const SkMatrix44& toXYZD50);
 
     const SkMatrix44 fToXYZD50;
 };
 
 #endif