Remove the SkCanvas comment API

src/utils/debugger/SkDebugCanvas.cpp

Index: src/utils/debugger/SkDebugCanvas.cpp
diff --git a/src/utils/debugger/SkDebugCanvas.cpp b/src/utils/debugger/SkDebugCanvas.cpp
index 21272d7d24ed9c51703137f99f19e5cb31afce00..df0a6d8d9cb3bb28eebb0f79dd3489794eed1c3b 100644
--- a/src/utils/debugger/SkDebugCanvas.cpp
+++ b/src/utils/debugger/SkDebugCanvas.cpp
@@ -432,18 +432,6 @@ void SkDebugCanvas::onDrawImageRect(const SkImage* image, const SkRect* src, con
     SkDebugf("SkDebugCanvas::onDrawImageRect unimplemented\n");
 }
 
-void SkDebugCanvas::beginCommentGroup(const char* description) {
-    this->addDrawCommand(new SkBeginCommentGroupCommand(description));
-}
-
-void SkDebugCanvas::addComment(const char* kywd, const char* value) {
-    this->addDrawCommand(new SkCommentCommand(kywd, value));
-}
-
-void SkDebugCanvas::endCommentGroup() {
-    this->addDrawCommand(new SkEndCommentGroupCommand());
-}
-
 void SkDebugCanvas::onDrawOval(const SkRect& oval, const SkPaint& paint) {
     this->addDrawCommand(new SkDrawOvalCommand(oval, paint));
 }