Revert of Make GrGLConfigConversionEffect work for Imagination and some other GPUs.

src/gpu/effects/GrConfigConversionEffect.h

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrConfigConversionEffect_DEFINED
 #define GrConfigConversionEffect_DEFINED
 
@@ skipping 12 matching lines @@
 public:
     /**
      * The PM->UPM or UPM->PM conversions to apply.
      */
     enum PMConversion {
         kNone_PMConversion = 0,
         kMulByAlpha_RoundUp_PMConversion,
         kMulByAlpha_RoundDown_PMConversion,
         kDivByAlpha_RoundUp_PMConversion,
         kDivByAlpha_RoundDown_PMConversion,
-        kMulByAlpha_RoundUp_HIGHP_PMConversion,
-        kMulByAlpha_RoundDown_HIGHP_PMConversion,
-        kDivByAlpha_RoundUp_HIGHP_PMConversion,
-        kDivByAlpha_RoundDown_HIGHP_PMConversion,
 
         kPMConversionCnt
     };
 
     // Installs an effect in the GrEffectStage to perform a config conversion.
     static const GrEffectRef* Create(GrTexture*,
                                      bool swapRedAndBlue,
                                      PMConversion pmConversion,
                                      const SkMatrix& matrix);
 
@@ skipping 26 matching lines @@
 
     bool            fSwapRedAndBlue;
     PMConversion    fPMConversion;
 
     GR_DECLARE_EFFECT_TEST;
 
     typedef GrSingleTextureEffect INHERITED;
 };
 
 #endif