Got RelaxedPrecision decorations working again in SPIR-V, and removed
no-longer-needed old-style precision handling code.

Bug: skia:8829
Change-Id: I72fc2ee2a305c9c72a3efa92dd44d18239eabaf2
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/198169
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Ethan Nicholas <ethannicholas@google.com>
diff --git a/src/gpu/effects/GrRRectBlurEffect.cpp b/src/gpu/effects/GrRRectBlurEffect.cpp
index 6f1f62b..ba9d701 100644
--- a/src/gpu/effects/GrRRectBlurEffect.cpp
+++ b/src/gpu/effects/GrRRectBlurEffect.cpp
@@ -69,11 +69,11 @@
         auto cornerRadius = _outer.cornerRadius();
         (void)cornerRadius;
         fCornerRadiusVar = args.fUniformHandler->addUniform(kFragment_GrShaderFlag, kHalf_GrSLType,
-                                                            kDefault_GrSLPrecision, "cornerRadius");
+                                                            "cornerRadius");
         fProxyRectVar = args.fUniformHandler->addUniform(kFragment_GrShaderFlag, kFloat4_GrSLType,
-                                                         kDefault_GrSLPrecision, "proxyRect");
+                                                         "proxyRect");
         fBlurRadiusVar = args.fUniformHandler->addUniform(kFragment_GrShaderFlag, kHalf_GrSLType,
-                                                          kDefault_GrSLPrecision, "blurRadius");
+                                                          "blurRadius");
         fragBuilder->codeAppendf(
                 "\nhalf2 translatedFragPos = half2(sk_FragCoord.xy - %s.xy);\nhalf threshold = %s "
                 "+ 2.0 * %s;\nhalf2 middle = half2((%s.zw - %s.xy) - float(2.0 * threshold));\nif "