Issue 19801. Fix for inlining referenced function with an expression body.

pkg/analysis_server/test/services/refactoring/inline_method_test.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library test.services.refactoring.inline_method;
 
 import 'dart:async';
 
 import 'package:analysis_server/src/protocol.dart' hide Element;
 import 'package:analysis_server/src/services/refactoring/inline_method.dart';
@@ skipping 981 matching lines @@
     return _assertSuccessfulRefactoring(r'''
 main() {
   print((a, b) {
     print(a);
     print(b);
   });
 }
 ''');
   }
 
+  test_reference_expressionBody() {
+    indexTestUnit(r'''
+String message() => 'Hello, World!';
+main() {
+  print(message);
+}
+''');
+    _createRefactoring('message()');
+    // validate change
+    return _assertSuccessfulRefactoring(r'''
+main() {
+  print(() => 'Hello, World!');
+}
+''');
+  }
+
   test_singleExpression_oneUsage() {
     indexTestUnit(r'''
 test(a, b) {
   return a + b;
 }
 main() {
   var res = test(1, 2);
 }
 ''');
     _createRefactoring('test(a, b)');
@@ skipping 163 matching lines @@
         });
       });
     });
   }
 
   void _createRefactoring(String search) {
     int offset = findOffset(search);
     refactoring = new InlineMethodRefactoring(searchEngine, testUnit, offset);
   }
 }