Removed Polymer from Observatory deps

packages/polymer/lib/src/build/build_log_combiner.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.
-
-/// Logic to combine all the ._buildLog.* logs into one ._buildLog file.
-library polymer.src.build.log_combiner;
-
-import 'dart:async';
-
-import 'package:barback/barback.dart';
-import 'package:code_transformers/messages/build_logger.dart';
-
-import 'common.dart';
-
-/// Logic to combine all the ._buildLog.* logs into one ._buildLog file.
-class BuildLogCombiner extends Transformer with PolymerTransformer {
-  final TransformOptions options;
-
-  BuildLogCombiner(this.options);
-
-  /// Run only on entry point html files and only if
-  /// options.injectBuildLogsInOutput is true.
-  bool isPrimary(idOrAsset) {
-    if (!options.injectBuildLogsInOutput) return false;
-    var id = idOrAsset is AssetId ? idOrAsset : idOrAsset.id;
-    return options.isHtmlEntryPoint(id);
-  }
-
-  Future apply(Transform transform) {
-    // Combine all ._buildLogs* files into one ._buildLogs file.
-    return BuildLogger.combineLogFiles(transform);
-  }
-}