Revert of sRGB support in Ganesh. Several pieces:

include/gpu/GrTypes.h

Index: include/gpu/GrTypes.h
diff --git a/include/gpu/GrTypes.h b/include/gpu/GrTypes.h
index 9be500d3b2206e004a9fbed3bc176365bae51d0a..3def9aaa993df434948afe15cf8263d655f42776 100644
--- a/include/gpu/GrTypes.h
+++ b/include/gpu/GrTypes.h
@@ -218,10 +218,6 @@
      */
     kSRGBA_8888_GrPixelConfig,
     /**
-     * Premultiplied and sRGB. Byte order is b,g,r,a.
-     */
-    kSBGRA_8888_GrPixelConfig,
-    /**
      * ETC1 Compressed Data
      */
     kETC1_GrPixelConfig,
@@ -272,10 +268,8 @@
 #endif
 #if SK_PMCOLOR_BYTE_ORDER(B,G,R,A)
     static const GrPixelConfig kSkia8888_GrPixelConfig = kBGRA_8888_GrPixelConfig;
-    static const GrPixelConfig kSkiaGamma8888_GrPixelConfig = kSBGRA_8888_GrPixelConfig;
 #elif SK_PMCOLOR_BYTE_ORDER(R,G,B,A)
     static const GrPixelConfig kSkia8888_GrPixelConfig = kRGBA_8888_GrPixelConfig;
-    static const GrPixelConfig kSkiaGamma8888_GrPixelConfig = kSRGBA_8888_GrPixelConfig;
 #else
     #error "SK_*32_SHIFT values must correspond to GL_BGRA or GL_RGBA format."
 #endif
@@ -317,7 +311,6 @@
         case kRGBA_8888_GrPixelConfig:
         case kBGRA_8888_GrPixelConfig:
         case kSRGBA_8888_GrPixelConfig:
-        case kSBGRA_8888_GrPixelConfig:
             return true;
         default:
             return false;
@@ -329,7 +322,6 @@
 static inline bool GrPixelConfigIsSRGB(GrPixelConfig config) {
     switch (config) {
         case kSRGBA_8888_GrPixelConfig:
-        case kSBGRA_8888_GrPixelConfig:
             return true;
         default:
             return false;
@@ -344,10 +336,6 @@
             return kRGBA_8888_GrPixelConfig;
         case kRGBA_8888_GrPixelConfig:
             return kBGRA_8888_GrPixelConfig;
-        case kSBGRA_8888_GrPixelConfig:
-            return kSRGBA_8888_GrPixelConfig;
-        case kSRGBA_8888_GrPixelConfig:
-            return kSBGRA_8888_GrPixelConfig;
         default:
             return kUnknown_GrPixelConfig;
     }
@@ -365,7 +353,6 @@
         case kRGBA_8888_GrPixelConfig:
         case kBGRA_8888_GrPixelConfig:
         case kSRGBA_8888_GrPixelConfig:
-        case kSBGRA_8888_GrPixelConfig:
             return 4;
         case kRGBA_half_GrPixelConfig:
             return 8;
@@ -396,16 +383,6 @@
             return true;
         default:
             return false;
-    }
-}
-
-static inline bool GrAllowSRGBForDestinationPixelConfig(GrPixelConfig config) {
-    switch (config) {
-        case kRGBA_8888_GrPixelConfig:
-        case kBGRA_8888_GrPixelConfig:
-            return false;
-        default:
-            return true;
     }
 }