Fix real_version_test on Windows.

sdk/lib/_internal/pub/lib/src/io.dart

Index: sdk/lib/_internal/pub/lib/src/io.dart
diff --git a/sdk/lib/_internal/pub/lib/src/io.dart b/sdk/lib/_internal/pub/lib/src/io.dart
index 3f7f553f945b6497ea9678265467652753d63f63..9662d1f9151b246267b3b089e948b63a0b0731d7 100644
--- a/sdk/lib/_internal/pub/lib/src/io.dart
+++ b/sdk/lib/_internal/pub/lib/src/io.dart
@@ -503,17 +503,7 @@ String get repoRoot {
   // Get the path to the directory containing this very file.
   var libDir = path.dirname(libraryPath('pub.io'));
 
-  // TODO(rnystrom): Remove this when #104 is fixed.
-  // If we are running from the async/await compiled build directory, walk out
-  // out of that. It will be something like:
-  //
-  //     <repo>/<build>/<config>/pub_async/lib/src
-  if (libDir.contains('pub_async')) {
-    return path.normalize(path.join(libDir, '..', '..', '..', '..', '..'));
-  }
-
-  // Otherwise, assume we're running directly from the source location in the
-  // repo:
+  // Assume we're running directly from the source location in the repo:
   //
   //      <repo>/sdk/lib/_internal/pub/lib/src
   return path.normalize(path.join(libDir, '..', '..', '..', '..', '..', '..'));