Elements. Move elementModelDeprecationMsg to src/.

Change-Id: Ia71ffd60041890536e28635be981e4c9c7a249ba
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/419981
Reviewed-by: Paul Berry <[email protected]>
Commit-Queue: Konstantin Shcheglov <[email protected]>

Author: scheglov

pkg/analyzer/api.txt

@@ -3012,7 +3012,6 @@ package:analyzer/dart/constant/value.dart:
     toSymbolValue (method: String? Function())
     toTypeValue (method: DartType? Function())
 package:analyzer/dart/element/element.dart:
-  elementModelDeprecationMsg (static getter: String)
   BindPatternVariableElement (class extends Object implements PatternVariableElement, deprecated):
     new (constructor: BindPatternVariableElement Function())
   ClassElement (class extends Object implements InterfaceElement, deprecated):

pkg/analyzer/lib/dart/element/element.dart

@@ -50,6 +50,8 @@ import 'package:analyzer/error/error.dart';
 import 'package:analyzer/source/line_info.dart';
 import 'package:analyzer/source/source.dart';
 import 'package:analyzer/src/dart/constant/evaluation.dart';
+import 'package:analyzer/src/dart/element/element.dart'
+    show elementModelDeprecationMsg;
 import 'package:analyzer/src/dart/resolver/scope.dart' show Namespace;
 import 'package:analyzer/src/generated/engine.dart' show AnalysisContext;
 import 'package:analyzer/src/generated/utilities_dart.dart';
@@ -58,12 +60,6 @@ import 'package:analyzer/src/task/api/model.dart' show AnalysisTarget;
 import 'package:meta/meta.dart';
 import 'package:pub_semver/pub_semver.dart';
 
-@internal
-const String elementModelDeprecationMsg = '''
-This is part of the old analyzer element model. Please see
-https://github.com/dart-lang/sdk/blob/main/pkg/analyzer/doc/element_model_migration_guide.md
-for information about how to migrate to the new element model.''';
-
 /// A pattern variable that is explicitly declared.
 ///
 /// Clients may not extend, implement or mix-in this class.

pkg/analyzer/lib/src/dart/element/element.dart

@@ -59,6 +59,11 @@ import 'package:analyzer/src/utilities/extensions/string.dart';
 import 'package:collection/collection.dart';
 import 'package:pub_semver/pub_semver.dart';
 
+const String elementModelDeprecationMsg = '''
+This is part of the old analyzer element model. Please see
+https://github.com/dart-lang/sdk/blob/main/pkg/analyzer/doc/element_model_migration_guide.md
+for information about how to migrate to the new element model.''';
+
 @Deprecated('This is an internal class, do not use it')
 // TODO(scheglov): remove it when DartDoc stops using it
 // https://github.com/dart-lang/dartdoc/issues/4015