Address issues found with analyzer

dart/site/try/src/compilation.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 trydart.compilation;
 
 import 'dart:html' show
     Blob,
     Element,
     ErrorEvent,
     IFrameElement,
     MessageEvent,
     Url,
     Worker,
     window;
 
-import 'dart:async' show
-    Timer;
-
 import 'dart:isolate' show
     ReceivePort,
     SendPort;
 
 import 'editor.dart' show
     addDiagnostic,
     isMalformedInput;
 
 import 'run.dart' show
     makeOutputFrame;
@@ skipping 252 matching lines @@
     if (window.parent != window) {
       // Test support.
       // TODO(ahe): Use '/' instead of '*' when Firefox is upgraded to version
       // 30 across build bots.  Support for '/' was added in version 29, and we
       // support the two most recent versions.
       window.parent.postMessage('$message\n', '*');
     }
     console.appendText('$message\n');
   }
 }
-
-void compilerIsolate(SendPort port) {
-  // TODO(ahe): Restore when restoring deferred loading.
-  // lazy.load().then((_) => port.listen(compile));
-  ReceivePort replyTo = new ReceivePort();
-  port.send(replyTo.sendPort);
-  replyTo.listen((message) {
-    List list = message as List;
-    try {
-      compile(list[0], list[1]);
-    } catch (exception, stack) {
-      port.send('$exception\n$stack');
-    }
-  });
-}