Revert of Refactor parsing and storage of SkGammas

src/core/SkColorSpacePriv.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.
  */
 
 #define SkColorSpacePrintf(...)
 
 inline bool color_space_almost_equal(float a, float b) {
     return SkTAbs(a - b) < 0.01f;
 }
+
+inline void set_gamma_value(SkGammaCurve* gamma, float value) {
+    if (color_space_almost_equal(2.2f, value)) {
+        gamma->fNamed = SkColorSpace::k2Dot2Curve_GammaNamed;
+    } else if (color_space_almost_equal(1.0f, value)) {
+        gamma->fNamed = SkColorSpace::kLinear_GammaNamed;
+    } else if (color_space_almost_equal(0.0f, value)) {
+        SkColorSpacePrintf("Treating invalid zero gamma as linear.");
+        gamma->fNamed = SkColorSpace::kLinear_GammaNamed;
+    } else {
+        gamma->fValue = value;
+    }
+}