Pull non-substantive changes out of GrShape mask drawing CL

This is pulled out of:
https://skia-review.googlesource.com/c/skia/+/146767 (Add GPU-side caching of mask-filtered path masks)

Change-Id: I2a80c8c664bb120b048cff47c431a8d595ae2c81
Reviewed-on: https://skia-review.googlesource.com/147809
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
diff --git a/src/core/SkMaskFilter.cpp b/src/core/SkMaskFilter.cpp
index 3ff4f93..e001f58 100644
--- a/src/core/SkMaskFilter.cpp
+++ b/src/core/SkMaskFilter.cpp
@@ -331,7 +331,7 @@
 }
 
 bool SkMaskFilterBase::directFilterMaskGPU(GrContext*,
-                                           GrRenderTargetContext* renderTargetContext,
+                                           GrRenderTargetContext*,
                                            GrPaint&&,
                                            const GrClip&,
                                            const SkMatrix& viewMatrix,
@@ -341,11 +341,11 @@
 }
 
 bool SkMaskFilterBase::directFilterRRectMaskGPU(GrContext*,
-                                                GrRenderTargetContext* renderTargetContext,
+                                                GrRenderTargetContext*,
                                                 GrPaint&&,
                                                 const GrClip&,
                                                 const SkMatrix& viewMatrix,
-                                                const SkStrokeRec& strokeRec,
+                                                const SkStrokeRec&,
                                                 const SkRRect& rrect,
                                                 const SkRRect& devRRect) const {
     return false;