Remove uses of GrPixelConfig version of GrBytesPerPixel.

Bug: skia:6718
Change-Id: I8421f38644567973f0b8de29b745ca9a471583bf
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/247598
Commit-Queue: Greg Daniel <egdaniel@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
diff --git a/src/gpu/mtl/GrMtlCaps.h b/src/gpu/mtl/GrMtlCaps.h
index 4901c00..7b8f592 100644
--- a/src/gpu/mtl/GrMtlCaps.h
+++ b/src/gpu/mtl/GrMtlCaps.h
@@ -46,6 +46,7 @@
     int maxRenderTargetSampleCount(const GrBackendFormat&) const override;
     int maxRenderTargetSampleCount(MTLPixelFormat) const;
 
+    size_t bytesPerPixel(const GrBackendFormat&) const override;
     size_t bytesPerPixel(MTLPixelFormat) const;
 
     SupportedWrite supportedWritePixelsColorType(GrColorType surfaceColorType,
@@ -143,7 +144,7 @@
 
         uint16_t fFlags = 0;
 
-        // This value is only valid for regular formats. Planar and compressed formats will be 0.
+        // This value is only valid for regular formats. Compressed formats will be 0.
         size_t fBytesPerPixel = 0;
 
         std::unique_ptr<ColorTypeInfo[]> fColorTypeInfos;