Revert of sRGB support in Ganesh. Several pieces:

src/gpu/gl/GrGLTexture.h

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #ifndef GrGLTexture_DEFINED
 #define GrGLTexture_DEFINED
 
 #include "GrGpu.h"
 #include "GrTexture.h"
 #include "GrGLUtil.h"
 
 class GrGLGpu;
 
 class GrGLTexture : public GrTexture {
 
 public:
     struct TexParams {
         GrGLenum fMinFilter;
         GrGLenum fMagFilter;
         GrGLenum fWrapS;
         GrGLenum fWrapT;
         GrGLenum fMaxMipMapLevel;
         GrGLenum fSwizzleRGBA[4];
-        GrGLenum fSRGBDecode;
         void invalidate() { memset(this, 0xff, sizeof(TexParams)); }
     };
 
     struct IDDesc {
         GrGLTextureInfo             fInfo;
         GrGpuResource::LifeCycle    fLifeCycle;
     };
 
     GrGLTexture(GrGLGpu*, const GrSurfaceDesc&, const IDDesc&);
     GrGLTexture(GrGLGpu*, const GrSurfaceDesc&, const IDDesc&, bool wasMipMapDataProvided);
@@ skipping 40 matching lines @@
     GrGLTextureInfo                 fInfo;
 
     // We track this separately from GrGpuResource because this may be both a texture and a render
     // target, and the texture may be wrapped while the render target is not.
     LifeCycle                       fTextureIDLifecycle;
 
     typedef GrTexture INHERITED;
 };
 
 #endif