Clean up imports in analysis_server and analyzer_cli (and one missed in analyzer)

pkg/analysis_server/test/services/correction/source_range_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.correction.source_range;
 
 import 'package:analysis_server/src/services/correction/source_range.dart';
+import 'package:analyzer/dart/element/element.dart';
 import 'package:analyzer/src/generated/ast.dart';
-import 'package:analyzer/src/generated/element.dart';
 import 'package:analyzer/src/generated/error.dart';
 import 'package:analyzer/src/generated/parser.dart';
 import 'package:analyzer/src/generated/source.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 import 'package:unittest/unittest.dart';
 
 import '../../abstract_single_unit.dart';
 import '../../utils.dart';
 
 main() {
@@ skipping 86 matching lines @@
     expect(rangeStartStart(mainName, mainBody), new SourceRange(0, 7));
   }
 
   void test_rangeToken() {
     resolveTestUnit(' main() {}');
     FunctionDeclaration mainFunction = testUnit.declarations[0];
     SimpleIdentifier mainName = mainFunction.name;
     expect(rangeToken(mainName.beginToken), new SourceRange(1, 4));
   }
 }