Revise barback logging patch.

sdk/lib/_internal/pub/lib/src/barback/pub_barback_logger.dart

Index: sdk/lib/_internal/pub/lib/src/barback/pub_barback_logger.dart
diff --git a/sdk/lib/_internal/pub/lib/src/barback/pub_barback_logger.dart b/sdk/lib/_internal/pub/lib/src/barback/pub_barback_logger.dart
deleted file mode 100644
index 374e1581d0e3790885ceb9b11975b028f7e8d7a9..0000000000000000000000000000000000000000
--- a/sdk/lib/_internal/pub/lib/src/barback/pub_barback_logger.dart
+++ /dev/null
@@ -1,63 +0,0 @@
-// 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 pub.pub_barback_logger;
-
-import 'package:barback/barback.dart';
-
-import '../log.dart' as log;
-
-/// A [BarbackLogger] that routes through pub's logging code.
-class PubBarbackLogger implements BarbackLogger {
-  /// Since both [LogEntry] objects and the message itself often redundantly
-  /// show the same context like the file where an error occurred, this tries
-  /// to avoid showing redundant data in the entry.
-  void logEntry(LogEntry entry) {
-    messageMentions(String text) {
-      return entry.message.toLowerCase().contains(text.toLowerCase());
-    }
-
-    var prefixParts = [];
-
-    // Show the level (unless the message mentions it.)
-    if (!messageMentions(entry.level.name)) {
-      prefixParts.add("${entry.level} in");
-    }
-
-    // Show the transformer.
-    prefixParts.add(entry.transform.transformer);
-
-    // Mention the primary input of the transform unless the message seems to.
-    if (!messageMentions(entry.transform.primaryId.path)) {
-      prefixParts.add("on ${entry.transform.primaryId}");
-    }
-
-    // If the relevant asset isn't the primary input, mention it unless the
-    // message already does.
-    if (entry.asset != entry.transform.primaryId &&
-        !messageMentions(entry.asset.path)) {
-      prefixParts.add("with input ${entry.asset}");
-    }
-
-    var prefix = "[${prefixParts.join(' ')}]:";
-    var message = entry.message;
-    if (entry.span != null) {
-      message = entry.span.getLocationMessage(entry.message);
-    }
-
-    switch (entry.level) {
-      case LogLevel.ERROR:
-        log.error("${log.red(prefix)}\n$message");
-        break;
-
-      case LogLevel.WARNING:
-        log.warning("${log.yellow(prefix)}\n$message");
-        break;
-
-      case LogLevel.INFO:
-        log.message("$prefix\n$message");
-        break;
-    }
-  }
-}