Remove the SkCanvas comment API

src/core/SkRecords.h

Index: src/core/SkRecords.h
diff --git a/src/core/SkRecords.h b/src/core/SkRecords.h
index 183c64776c7d77c9357e239b54215f96c458a055..89e4e63b56243b0f850ecf3720aaa47a6f3be944 100644
--- a/src/core/SkRecords.h
+++ b/src/core/SkRecords.h
@@ -36,9 +36,6 @@ namespace SkRecords {
     M(ClipRRect)                                                    \
     M(ClipRect)                                                     \
     M(ClipRegion)                                                   \
-    M(BeginCommentGroup)                                            \
-    M(AddComment)                                                   \
-    M(EndCommentGroup)                                              \
     M(DrawBitmap)                                                   \
     M(DrawBitmapNine)                                               \
     M(DrawBitmapRectToRect)                                         \
@@ -251,10 +248,6 @@ RECORD3(ClipRRect,  SkIRect, devBounds, SkRRect,       rrect, RegionOpAndAA, opA
 RECORD3(ClipRect,   SkIRect, devBounds, SkRect,         rect, RegionOpAndAA, opAA);
 RECORD3(ClipRegion, SkIRect, devBounds, SkRegion,     region, SkRegion::Op,    op);
 
-RECORD1(BeginCommentGroup, PODArray<char>, description);
-RECORD2(AddComment, PODArray<char>, key, PODArray<char>, value);
-RECORD0(EndCommentGroup);
-
 // While not strictly required, if you have an SkPaint, it's fastest to put it first.
 RECORD4(DrawBitmap, Optional<SkPaint>, paint,
                     ImmutableBitmap, bitmap,