refactor(dart): Format Dart code

Use the dart formatter to clean up all pure Dart code.

Closes #4832

modules/angular2/test/web_workers/debug_tools/bootstrap.server.spec.dart

@@ -10,7 +10,7 @@ import "dart:convert";
 
 main() {
   describe("bootstrapWebWorkerCommon", () {
-    it ("should bootstrap on a Dart VM",  () {
+    it("should bootstrap on a Dart VM", () {
       reflector.reflectionCapabilities = new ReflectionCapabilities();
       var buses = createPairedMessageBuses();
       bootstrapWebWorkerCommon(App, buses.worker);

modules/angular2/test/web_workers/debug_tools/message_bus_common.dart

@@ -18,6 +18,7 @@ void expectSinkSendsEncodedJson(SpyObject socket, MessageBusSink sink,
 }
 
 void expectMessageEquality(String message, Map expectedData, String channel) {
-  expect(JSON.decode(message))
-      .toEqual([{'channel': channel, 'message': expectedData}]);
+  expect(JSON.decode(message)).toEqual([
+    {'channel': channel, 'message': expectedData}
+  ]);
 }

modules/angular2/test/web_workers/debug_tools/multi_client_server_message_bus.server.spec.dart

@@ -79,8 +79,9 @@ main() {
       var random = new Random();
       for (var i = 0; i < numMessages; i++) {
         var message = {'value': random.nextInt(MAX)};
-        messageHistory
-            .add(JSON.encode([{'channel': CHANNEL, 'message': message}]));
+        messageHistory.add(JSON.encode([
+          {'channel': CHANNEL, 'message': message}
+        ]));
       }
       // copy the message history to ensure the test fails if the wrapper modifies the list
       return new List.from(messageHistory);
@@ -189,8 +190,7 @@ main() {
               messageHistory, resultMarkers, result.socket);
           socket.setPrimary(true);
 
-          var source =
-              new MultiClientServerMessageBusSource();
+          var source = new MultiClientServerMessageBusSource();
           source.onResult.listen((result) => async.done());
           source.initChannel(CHANNEL, false);
           source.addConnection(socket);

modules/angular2/test/web_workers/debug_tools/single_client_server_message_bus.server.spec.dart

@@ -94,8 +94,9 @@ main() {
             async.done();
           });
 
-          controller
-              .add(JSON.encode([{'channel': CHANNEL, 'message': MESSAGE}]));
+          controller.add(JSON.encode([
+            {'channel': CHANNEL, 'message': MESSAGE}
+          ]));
         }));
   });
 }

modules/angular2/test/web_workers/debug_tools/web_socket_message_bus_spec.dart

@@ -50,8 +50,9 @@ main() {
           });
 
           var event = new SpyMessageEvent();
-          event.spy("get:data").andCallFake(
-              () => JSON.encode([{'channel': CHANNEL, 'message': MESSAGE}]));
+          event.spy("get:data").andCallFake(() => JSON.encode([
+                {'channel': CHANNEL, 'message': MESSAGE}
+              ]));
           controller.add(event);
         }));
   });