Revert of sRGB support in Ganesh. Several pieces:

src/gpu/gl/GrGLCaps.h

Index: src/gpu/gl/GrGLCaps.h
diff --git a/src/gpu/gl/GrGLCaps.h b/src/gpu/gl/GrGLCaps.h
index ed673e7ce73cd507a1cc96d5545431bd5029a322..376610d8b0d9636c299f0a4fee95174c89f3634f 100644
--- a/src/gpu/gl/GrGLCaps.h
+++ b/src/gpu/gl/GrGLCaps.h
@@ -120,10 +120,12 @@
              const GrGLInterface* glInterface);
 
     bool isConfigTexturable(GrPixelConfig config) const override {
+        SkASSERT(kGrPixelConfigCnt > config);
         return SkToBool(fConfigTable[config].fFlags & ConfigInfo::kTextureable_Flag);
     }
 
     bool isConfigRenderable(GrPixelConfig config, bool withMSAA) const override {
+        SkASSERT(kGrPixelConfigCnt > config);
         if (withMSAA) {
             return SkToBool(fConfigTable[config].fFlags & ConfigInfo::kRenderableWithMSAA_Flag);
         } else {
@@ -132,6 +134,7 @@
     }
 
     bool isConfigTexSupportEnabled(GrPixelConfig config) const {
+        SkASSERT(kGrPixelConfigCnt > config);
         return SkToBool(fConfigTable[config].fFlags & ConfigInfo::kCanUseTexStorage_Flag);
     }