Rename analyzer_experimental to analyzer.

pkg/analyzer_experimental/test/parse_compilation_unit_test.dart

-// Copyright (c) 2013, 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.
-
-import 'package:analyzer_experimental/analyzer.dart';
-import 'package:unittest/unittest.dart';
-
-void main() {
-  test("parses a valid compilation unit successfully", () {
-    var unit = parseCompilationUnit("void main() => print('Hello, world!');");
-    expect(unit.toString(), equals("void main() => print('Hello, world!');"));
-  });
-
-  test("throws errors for an invalid compilation unit", () {
-    expect(() {
-      parseCompilationUnit("void main() => print('Hello, world!')",
-          name: 'test.dart');
-    }, throwsA(predicate((error) {
-      return error is AnalyzerErrorGroup &&
-          error.toString().contains("line 1 of test.dart");
-    })));
-  });
-
-  test("defaults to '<unknown source>' if no name is provided", () {
-    expect(() {
-      parseCompilationUnit("void main() => print('Hello, world!')");
-    }, throwsA(predicate((error) {
-      return error is AnalyzerErrorGroup &&
-          error.toString().contains("line 1 of <unknown source>");
-    })));
-  });
-}