Replace ${name} with $name where possible.

pkg/analyzer/lib/src/services/runtime/log.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.
 
 /// Simple wrapper for [Logger] library.
 library runtime.log;
 
 import "package:logging/logging.dart";
 
 /** Log message at level [Level.FINEST]. */
@@ skipping 23 matching lines @@
 /// Specifies that all log records should be logged.
 void everything() {
   _logger.level = Level.ALL;
 }
 
 /// Sends all log record to the console.
 void toConsole() {
   _logger.onRecord.listen((LogRecord record) {
     String levelString = record.level.toString();
     while (levelString.length < 6) levelString += ' ';
-    print('${record.time}: ${levelString} ${record.message}');
+    print('${record.time}: $levelString ${record.message}');
   });
 }
 
 /// The root [Logger].
 final Logger _logger = Logger.root;