Remove the SkCanvas comment API

include/utils/SkDumpCanvas.h

Index: include/utils/SkDumpCanvas.h
diff --git a/include/utils/SkDumpCanvas.h b/include/utils/SkDumpCanvas.h
index cd94501a026b9aaa43e80f82fdefc1550bdef533..cbae148a16b90c5b645e34225fedbab9f6cb7950 100644
--- a/include/utils/SkDumpCanvas.h
+++ b/include/utils/SkDumpCanvas.h
@@ -49,10 +49,6 @@ public:
         kDrawPatch_Verb,
         kDrawData_Verb, // obsolete
 
-        kBeginCommentGroup_Verb,
-        kAddComment_Verb,
-        kEndCommentGroup_Verb,
-
         kCull_Verb
     };
 
@@ -75,10 +71,6 @@ public:
 
     int getNestLevel() const { return fNestLevel; }
 
-    void beginCommentGroup(const char* description) override;
-    void addComment(const char* kywd, const char* value) override;
-    void endCommentGroup() override;
-
 protected:
     void willSave() override;
     SaveLayerStrategy willSaveLayer(const SkRect*, const SkPaint*, SaveFlags) override;