Late night strong mode cleaning.

tests/compiler/dart2js/sourcemaps/sourcemap_helper.dart

 // Copyright (c) 2015, 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 sourcemap.helper;
 
 import 'dart:async';
 import 'dart:io';
 import 'package:compiler/compiler_new.dart';
 import 'package:compiler/src/apiimpl.dart' as api;
 import 'package:compiler/src/commandline_options.dart';
-import 'package:compiler/src/null_compiler_output.dart' show NullSink;
 import 'package:compiler/src/elements/elements.dart';
 import 'package:compiler/src/elements/entities.dart';
-import 'package:compiler/src/helpers/helpers.dart';
 import 'package:compiler/src/filenames.dart';
 import 'package:compiler/src/io/code_output.dart';
 import 'package:compiler/src/io/source_file.dart';
 import 'package:compiler/src/io/source_information.dart';
 import 'package:compiler/src/io/position_information.dart';
 import 'package:compiler/src/js/js.dart' as js;
 import 'package:compiler/src/js/js_debug.dart';
 import 'package:compiler/src/js/js_source_mapping.dart';
 import 'package:compiler/src/js_backend/js_backend.dart';
 import 'package:compiler/src/source_file_provider.dart';
-import 'package:kernel/ast.dart' show Location;
 import '../memory_compiler.dart';
 import '../output_collector.dart';
 
 class SourceFileSink implements OutputSink {
   final String filename;
   StringBuffer sb = new StringBuffer();
   SourceFile sourceFile;
 
   SourceFileSink(this.filename);
 
@@ skipping 281 matching lines @@
     if (options.contains(Flags.disableInlining)) {
       if (verbose) print('Inlining disabled');
     }
     api.CompilerImpl compiler = await compilerFor(
         outputProvider: outputProvider,
         // TODO(johnniwinther): Use [verbose] to avoid showing diagnostics.
         options: ['--out=$targetUri', '--source-map=$sourceMapFileUri']
           ..addAll(options));
 
     JavaScriptBackend backend = compiler.backend;
-    var handler = compiler.handler;
+    dynamic handler = compiler.handler;
     SourceFileProvider sourceFileProvider = handler.provider;
     sourceFileManager =
         new ProviderSourceFileManager(sourceFileProvider, outputProvider);
     RecordingSourceInformationStrategy strategy =
         new RecordingSourceInformationStrategy(
             backend.sourceInformationStrategy);
     backend.sourceInformationStrategy = strategy;
     await compiler.run(inputUri);
 
     SourceMapInfo mainSourceMapInfo;
     Map<Element, SourceMapInfo> elementSourceMapInfos =
         <Element, SourceMapInfo>{};
     if (perElement) {
-      backend.generatedCode
-          .forEach((MemberElement element, js.Expression node) {
+      backend.generatedCode.forEach((_element, js.Expression node) {
+        MemberElement element = _element;
         RecordedSourceInformationProcess subProcess =
             strategy.subProcessForNode(node);
         if (subProcess == null) {
           // TODO(johnniwinther): Find out when this is happening and if it
           // is benign. (Known to happen for `bool#fromString`)
           print('No subProcess found for $element');
           return;
         }
         LocationMap nodeMap = subProcess.nodeToSourceLocationsMap;
         String code = subProcess.code;
@@ skipping 218 matching lines @@
       absoluteUri = base.resolveUri(uri);
     } else {
       absoluteUri = base.resolve(uri);
     }
     return sourceFiles.putIfAbsent(absoluteUri, () {
       String text = new File.fromUri(absoluteUri).readAsStringSync();
       return new StringSourceFile.fromUri(absoluteUri, text);
     });
   }
 }