dart2js: Remove (some) unused imports.

pkg/compiler/lib/src/js_emitter/js_emitter.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.
 
 library dart2js.js_emitter;
 
-import 'dart:async';
 import 'dart:convert';
 
 import '../common.dart';
 
 import '../constants/expressions.dart';
 import '../constants/values.dart';
 
 import '../closure.dart' show
     ClosureClassElement,
     ClosureClassMap,
     ClosureFieldElement,
     CapturedVariable;
 
 import '../dart_types.dart' show
     TypedefType;
 
 import '../io/code_output.dart';
 
 import '../elements/elements.dart' show
     ConstructorBodyElement,
     ElementKind,
     FieldElement,
     ParameterElement,
     TypeVariableElement;
 
-import '../hash/sha1.dart' show hashOfString;
-
 import '../helpers/helpers.dart';  // Included for debug helpers.
 
 import '../js/js.dart' as jsAst;
 import '../js/js.dart' show
     js;
 
 import '../js_backend/js_backend.dart' show
     CheckedModeHelper,
     ConstantEmitter,
     CustomElementsAnalysis,
@@ skipping 37 matching lines @@
 
 import '../util/util.dart' show
     equalElements;
 
 import '../deferred_load.dart' show
     OutputUnit;
 
 import 'package:_internal/compiler/js_lib/shared/embedded_names.dart'
     as embeddedNames;
 
 import '../hash/sha1.dart';

[sigurdm, 2015/01/16 07:38:35]

Sha1 was a double-import. It might be better to remove this one, and keep the
'show-version'

[floitsch, 2015/01/16 09:09:48]

It was the "Hasher" class that was imported. The hashOfString wasn't used
anymore.
done.

 
 part 'class_stub_generator.dart';
 part 'code_emitter_task.dart';
 part 'helpers.dart';
 part 'interceptor_stub_generator.dart';
 part 'native_generator.dart';
 part 'type_test_generator.dart';
 part 'type_test_registry.dart';
 
 part 'old_emitter/class_builder.dart';
 part 'old_emitter/class_emitter.dart';
 part 'old_emitter/code_emitter_helper.dart';
 part 'old_emitter/container_builder.dart';
 part 'old_emitter/declarations.dart';
 part 'old_emitter/emitter.dart';
 part 'old_emitter/interceptor_emitter.dart';
 part 'old_emitter/metadata_emitter.dart';
 part 'old_emitter/nsm_emitter.dart';
 part 'old_emitter/reflection_data_parser.dart';
 part 'old_emitter/type_test_emitter.dart';