Properly update git binary snapshots during pub upgrade.

sdk/lib/_internal/pub/test/global/activate/git_package_test.dart

 // Copyright (c) 2014, 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 'package:scheduled_test/scheduled_test.dart';
+
 import '../../descriptor.dart' as d;
 import '../../test_pub.dart';
 
 main() {
   initConfig();
   integration('activates a package from a Git repo', () {
     ensureGit();
 
     d.git('foo.git', [
       d.libPubspec("foo", "1.0.0"),
       d.dir("bin", [
         d.file("foo.dart", "main() => print('ok');")
       ])
     ]).create();
 
     schedulePub(args: ["global", "activate", "-sgit", "../foo.git"],
-        output: '''
-            Resolving dependencies...
-            + foo 1.0.0 from git ../foo.git
-            Precompiling executables...
-            Loading source assets...
-            Precompiled foo:foo.
-            Activated foo 1.0.0 from Git repository "../foo.git".''');
+        output: allOf(
+            startsWith(
+                'Resolving dependencies...\n'
+                '+ foo 1.0.0 from git ../foo.git at '),
+            // Specific revision number goes here.
+            endsWith(
+                'Precompiling executables...\n'
+                'Loading source assets...\n'
+                'Precompiled foo:foo.\n'
+                'Activated foo 1.0.0 from Git repository "../foo.git".')));
   });
 }