Deprecate unintended APIs.

pkg/analyzer/lib/src/lint/linter.dart

Index: pkg/analyzer/lib/src/lint/linter.dart
diff --git a/pkg/analyzer/lib/src/lint/linter.dart b/pkg/analyzer/lib/src/lint/linter.dart
index 09c62c65d01cdbcb9e0483f113cc4d4cd2c2f75e..302e7fc211bbab4b0df21e5eb10195b2403113b4 100644
--- a/pkg/analyzer/lib/src/lint/linter.dart
+++ b/pkg/analyzer/lib/src/lint/linter.dart
@@ -26,6 +26,7 @@ import 'package:path/path.dart' as p;
 typedef Printer(String msg);
 
 /// Describes a String in valid camel case format.
+@deprecated // Never intended for public use.
 class CamelCaseString {
   static final _camelCaseMatcher = new RegExp(r'[A-Z][a-z]*');
   static final _camelCaseTester = new RegExp(r'^([_$]*)([A-Z?$]+[a-z0-9]*)+$');