Clean up some warnings and deprecated calls.

utils/pub/log.dart

 // Copyright (c) 2012, 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.
 
 /// Message logging.
 library log;
 
 import 'dart:async';
 import 'io.dart';
 
@@ skipping 92 matching lines @@
     } else {
       io(endMessage(result));
     }
     return result;
   });
 }
 
 /// Logs the spawning of an [executable] process with [arguments] at [IO]
 /// level.
 void process(String executable, List<String> arguments) {
-  io("Spawning $executable ${Strings.join(arguments, ' ')}");
+  io("Spawning $executable ${arguments.join(' ')}");
 }
 
 /// Logs the results of running [executable].
 void processResult(String executable, PubProcessResult result) {
   // Log it all as one message so that it shows up as a single unit in the logs.
   var buffer = new StringBuffer();
   buffer.add("Finished $executable. Exit code ${result.exitCode}.");
 
   dumpOutput(String name, List<String> output) {
     if (output.length == 0) {
@@ skipping 95 matching lines @@
         sink.add('    | '.charCodes);
       }
     }
 
     sink.add(line.charCodes);
     sink.add('\n'.charCodes);
 
     firstLine = false;
   }
 }