Mark script kinds as private in the service protocol.

runtime/vm/service/service.md

Index: runtime/vm/service/service.md
diff --git a/runtime/vm/service/service.md b/runtime/vm/service/service.md
index 4fb2078f4b33b9be8e511e4f51c498e61d8bf37c..705205ef218010d7f6453e6ba2d81e2053e5c70c 100644
--- a/runtime/vm/service/service.md
+++ b/runtime/vm/service/service.md
@@ -1531,9 +1531,6 @@ A _SentinelType_ is used to distinguish different kinds of _Sentinel_ objects.
 class @Script extends @Object {
   // The uri from which this script was loaded.
   string uri;
-
-  // What kind of script is this?
-  string kind;
 }
 ```
 
@@ -1544,9 +1541,6 @@ class Script extends Object {
   // The uri from which this script was loaded.
   string uri;
 
-  // What kind of script is this?
-  ScriptKind kind;
-
   // The library which owns this script.
   @Library library;
 
@@ -1578,21 +1572,6 @@ tokenPos | line | column
 101 | 1 | 8
 102 | 2 | 7
 
-### ScriptKind
-
-```
-enum ScriptKind {
-  script,
-  library,
-  source,
-  patch
-}
-```
-
-A _ScriptKind_ is used to classify a _Script_.
-
-TODO: We need to explain what this is about or find a way to hide it.
-
 ### Stack
 
 ```