Fix git on non-Windows. Fix create_sdk on machines using svn.

utils/pub/io.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.
 
 /**
  * Helper functionality to make working with IO easier.
  */
 #library('io');
 
 #import('dart:io');
@@ skipping 525 matching lines @@
   });
   return completer.future;
 }
 
 /// Tests whether or not the git command-line app is available for use.
 Future<bool> get isGitInstalled {
   if (_isGitInstalledCache != null) {
     // TODO(rnystrom): The sleep is to pump the message queue. Can use
     // Future.immediate() when #3356 is fixed.
     return sleep(0).transform((_) => _isGitInstalledCache);
+  }
 
-    return _gitCommand.transform((git) => git != null);
-  }
+  return _gitCommand.transform((git) => git != null);
 }
 
 /// Run a git process with [args] from [workingDir].
 Future<PubProcessResult> runGit(List<String> args, [String workingDir]) =>
     _gitCommand.chain((git) => runProcess(git, args, workingDir));
 
 /// Returns the name of the git command-line app, or null if Git could not be
 /// found on the user's PATH.
 Future<String> get _gitCommand {
   // TODO(nweiz): Just use Future.immediate once issue 3356 is fixed.
@@ skipping 146 matching lines @@
   return new Directory(entry);
 }
 
 /**
  * Gets a [Uri] for [uri], which can either already be one, or be a [String].
  */
 Uri _getUri(uri) {
   if (uri is Uri) return uri;
   return new Uri.fromString(uri);
 }