Remove unused PubCommand stuff.

tools/testing/dart/command.dart

 // Copyright (c) 2017, 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.
 
 import 'dart:async';
 // We need to use the 'io' prefix here, otherwise io.exitCode will shadow
 // CommandOutput.exitCode in subclasses of CommandOutput.
 import 'dart:io' as io;
 
 import 'command_output.dart';
@@ skipping 85 matching lines @@
       [Map<String, String> environment, String workingDirectory]) {
     return new ProcessCommand._(
         displayName, executable, arguments, environment, workingDirectory);
   }
 
   static Command copy(String sourceDirectory, String destinationDirectory) {
     return new CleanDirectoryCopyCommand._(
         sourceDirectory, destinationDirectory);
   }
 
-  static Command pub(String pubCommand, String pubExecutable,
-      String pubspecYamlDirectory, String pubCacheDirectory,
-      {List<String> arguments: const <String>[]}) {
-    return new PubCommand._(pubCommand, pubExecutable, pubspecYamlDirectory,
-        pubCacheDirectory, arguments);
-  }
-
   static Command makeSymlink(String link, String target) {
     return new MakeSymlinkCommand._(link, target);
   }
 
   /// A descriptive name for this command.
   final String displayName;
 
   /// Number of times this command *can* be retried.
   int get maxNumRetries => 2;
 
@@ skipping 349 matching lines @@
       'to an attached device. Uses (and requires) adb.';
 }
 
 class JSCommandlineCommand extends ProcessCommand {
   JSCommandlineCommand._(
       String displayName, String executable, List<String> arguments,
       [Map<String, String> environmentOverrides = null])
       : super._(displayName, executable, arguments, environmentOverrides);
 }
 
-class PubCommand extends ProcessCommand {
-  final String command;
-
-  PubCommand._(String pubCommand, String pubExecutable,
-      String pubspecYamlDirectory, String pubCacheDirectory, List<String> args)
-      : command = pubCommand,
-        super._(
-            'pub_$pubCommand',
-            new io.File(pubExecutable).absolute.path,
-            [pubCommand]..addAll(args),
-            {'PUB_CACHE': pubCacheDirectory},
-            pubspecYamlDirectory);
-
-  void _buildHashCode(HashCodeBuilder builder) {
-    super._buildHashCode(builder);
-    builder.addJson(command);
-  }
-
-  bool _equal(PubCommand other) =>
-      super._equal(other) && command == other.command;
-}
-
 /// [ScriptCommand]s are executed by dart code.
 abstract class ScriptCommand extends Command {
   ScriptCommand._(String displayName) : super._(displayName);
 
   Future<ScriptCommandOutput> run();
 }
 
 class CleanDirectoryCopyCommand extends ScriptCommand {
   final String _sourceDirectory;
   final String _destinationDirectory;
@@ skipping 71 matching lines @@
 
   void _buildHashCode(HashCodeBuilder builder) {
     super._buildHashCode(builder);
     builder.addJson(_link);
     builder.addJson(_target);
   }
 
   bool _equal(MakeSymlinkCommand other) =>
       super._equal(other) && _link == other._link && _target == other._target;
 }