Remove unused PubCommand stuff.

tools/testing/dart/command.dart

Index: tools/testing/dart/command.dart
diff --git a/tools/testing/dart/command.dart b/tools/testing/dart/command.dart
index e2b50b2e733cc0dceed0615b6357bfa4a7741dac..3199d97924b6f79dd2e306b2e4ec41468eb3f197 100644
--- a/tools/testing/dart/command.dart
+++ b/tools/testing/dart/command.dart
@@ -103,13 +103,6 @@ class Command {
         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);
   }
@@ -479,28 +472,6 @@ class JSCommandlineCommand extends ProcessCommand {
       : 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);