Remove all usage of SkSurfaceProps::isGammaCorrect()

src/effects/SkGpuBlurUtils.h

Index: src/effects/SkGpuBlurUtils.h
diff --git a/src/effects/SkGpuBlurUtils.h b/src/effects/SkGpuBlurUtils.h
index 550f3b8d6f9a6185f41ea5cae0172239351c8006..a5de6a242ac86bce661de0ba42b54d56d8c87b22 100644
--- a/src/effects/SkGpuBlurUtils.h
+++ b/src/effects/SkGpuBlurUtils.h
@@ -24,7 +24,6 @@ namespace SkGpuBlurUtils {
     * @param context         The GPU context
     * @param srcTexture      The source texture to be blurred.
     * @param colorSpace      Color space of the source (used for the drawContext result, too).
-    * @param gammaCorrect    Should blur be gamma-correct (sRGB to linear, etc...)
     * @param dstBounds       The destination bounds, relative to the source texture.
     * @param srcBounds       The source bounds, relative to the source texture. If non-null,
     *                        no pixels will be sampled outside of this rectangle.
@@ -35,7 +34,6 @@ namespace SkGpuBlurUtils {
     sk_sp<GrDrawContext> GaussianBlur(GrContext* context,
                                       GrTexture* srcTexture,
                                       sk_sp<SkColorSpace> colorSpace,
-                                      bool gammaCorrect,
                                       const SkIRect& dstBounds,
                                       const SkIRect* srcBounds,
                                       float sigmaX,