Suppress unnamed library analyzer spam in shelldb

Revert "Add library names to many sky libraries"

This reverts commit 1337e0a803a54ee92d6dce7f8c4a6335f7cbb9fa.

BUG=
R=abarth@chromium.org

Review URL: https://codereview.chromium.org/1142893007

examples/stocks/lib/stock_arrow.dart

@@ -2,8 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-library stock_arrow;
-
 import 'dart:math';
 import 'package:sky/framework/fn.dart';
 import 'package:sky/framework/layout.dart';

examples/stocks/lib/stock_data.dart

@@ -2,8 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-library stock_data;
-
 import 'dart:convert';
 import 'dart:math';
 import 'package:sky/framework/net/fetch.dart';

examples/stocks/lib/stock_list.dart

@@ -2,8 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-library stock_list;
-
 import 'package:sky/framework/components/fixed_height_scrollable.dart';
 import 'package:sky/framework/fn.dart';
 import 'stock_data.dart';