Revert "Build Observatory with runtime"

runtime/observatory/web/main.dart

-// Copyright (c) 2014, 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.
-
-import 'package:logging/logging.dart';
-import 'package:observatory/app.dart';
-import 'package:polymer/polymer.dart';
-
-main() {
-  Logger.root.level = Level.INFO;
-  Logger.root.onRecord.listen((LogRecord rec) {
-      if (rec.level == Level.WARNING &&
-          rec.message.startsWith('Error evaluating expression') &&
-          (rec.message.contains("Can't assign to null: ") ||
-           rec.message.contains('Expression is not assignable: '))) {
-        // Suppress flaky polymer errors.
-        return;
-      }
-      print('${rec.level.name}: ${rec.time}: ${rec.message}');
-  });
-  Logger.root.info('Starting Observatory');
-  GoogleChart.initOnce().then((_) {
-    // Charts loaded, initialize polymer.
-    Logger.root.info('Initializing Polymer');
-    try {
-      initPolymer();
-    } catch (e) {
-      Logger.root.severe('Error initializing polymer: $e');
-    }
-  });
-}