Remove all usage of SkSurfaceProps::isGammaCorrect()

include/gpu/GrDrawContext.h

Index: include/gpu/GrDrawContext.h
diff --git a/include/gpu/GrDrawContext.h b/include/gpu/GrDrawContext.h
index 01f4ac963b47f31c96e09b6a9115e8b21e1f4091..d5bde08288181e6777db0a5271e2954c2db4e81c 100644
--- a/include/gpu/GrDrawContext.h
+++ b/include/gpu/GrDrawContext.h
@@ -274,7 +274,7 @@ public:
     int height() const { return fRenderTarget->height(); }
     GrPixelConfig config() const { return fRenderTarget->config(); }
     int numColorSamples() const { return fRenderTarget->numColorSamples(); }
-    bool isGammaCorrect() const { return fSurfaceProps.isGammaCorrect(); }
+    bool isGammaCorrect() const { return SkToBool(fColorSpace.get()); }
     SkSourceGammaTreatment sourceGammaTreatment() const {
         return this->isGammaCorrect() ? SkSourceGammaTreatment::kRespect
                                       : SkSourceGammaTreatment::kIgnore;