Mark analyzer_cli as strong-mode clean

pkg/analyzer_cli/lib/src/build_mode.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 analyzer_cli.src.build_mode;
 
 import 'dart:core' hide Resource;
 import 'dart:io' as io;
 
 import 'package:analyzer/dart/ast/ast.dart' show CompilationUnit;
@@ skipping 51 matching lines @@
   /**
    * Perform a single loop step.
    */
   @override
   WorkResponse performRequest(WorkRequest request) {
     errorBuffer.clear();
     outBuffer.clear();
     try {
       // Add in the dart-sdk argument if `dartSdkPath` is not null, otherwise it
       // will try to find the currently installed sdk.
-      var arguments = new List.from(request.arguments);
+      var arguments = new List<String>.from(request.arguments);
       if (dartSdkPath != null &&
           !arguments.any((arg) => arg.startsWith('--dart-sdk'))) {
         arguments.add('--dart-sdk=$dartSdkPath');
       }
       // Prepare options.
       CommandLineOptions options =
           CommandLineOptions.parse(arguments, (String msg) {
         throw new ArgumentError(msg);
       });
       // Analyze and respond.
@@ skipping 299 matching lines @@
             'Illegal input file (must be "\$uri|\$path"): $sourceFile');
         return null;
       }
       Uri uri = Uri.parse(sourceFile.substring(0, pipeIndex));
       String path = sourceFile.substring(pipeIndex + 1);
       uriToFileMap[uri] = new JavaFile(path);
     }
     return uriToFileMap;
   }
 }