Format all dart dev compiler files

pkg/dev_compiler/web/main.dart

 #!/usr/bin/env dart
 // Copyright (c) 2016, 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.
 
 @JS()
 library dev_compiler.web.main;
 
 import 'dart:async';
 
 import 'package:args/command_runner.dart';
 import 'package:js/js.dart';
 
 import 'web_command.dart';
 
 @JS(r'$setUpDartDevCompilerInBrowser')
 external set setUpCompilerInBrowser(Function function);
 
 Future<Function> _setUpCompilerInBrowser;
 main() {
   var args = ['compile', '--repl-compile'];
 
   // Avoid race condition when users try to call $setUpDartDevCompilerInBrowser
   // before it is ready by installing the method immediately and making the body
   // of the method async.
-  setUpCompilerInBrowser = allowInterop((String summaryRoot, String sdkUrl,
+  setUpCompilerInBrowser = allowInterop((String summaryRoot,
+      String sdkUrl,
       List<String> summaryUrls,
       Function onCompileReady,
       Function onError) async {
     (await _setUpCompilerInBrowser)(
         summaryRoot, sdkUrl, summaryUrls, onCompileReady, onError);
   });
   _runCommand(args);
 }
 
 /// Runs a single compile command, and returns an exit code.
@@ skipping 39 matching lines @@
         "any other information that may help us track it down. Thanks!");
     messageHandler("");
     messageHandler("    dartdevc arguments: " + args.join(' '));
     messageHandler("");
     messageHandler("```");
     messageHandler(error);
     messageHandler(stackTrace);
     messageHandler("```");
   }
 }