Get rid of all the library tags.

lib/src/git.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 for invoking Git.
-library pub.git;
-
 import 'dart:async';
 import 'dart:io';
 
 import 'package:stack_trace/stack_trace.dart';
 
 import 'exceptions.dart';
 import 'io.dart';
 import 'log.dart' as log;
 import 'utils.dart';
 
@@ skipping 96 matching lines @@
     var result = runProcessSync(command, ["--version"]);
     var regexp = new RegExp("^git version");
     return result.stdout.length == 1 && regexp.hasMatch(result.stdout.single);
   } on ProcessException catch (error, stackTrace) {
     var chain = new Chain.forTrace(stackTrace);
     // If the process failed, they probably don't have it.
     log.error('Git command is not "$command": $error\n$chain');
     return false;
   }
 }