Replace 'the the' with 'the'

pkg/front_end/lib/src/fasta/loader.dart

Index: pkg/front_end/lib/src/fasta/loader.dart
diff --git a/pkg/front_end/lib/src/fasta/loader.dart b/pkg/front_end/lib/src/fasta/loader.dart
index f8a7b4231de619a1ff8b9b7fa5a7b27336557101..6f4bbb730890e45ff9d2a58aa1601802e9d056e6 100644
--- a/pkg/front_end/lib/src/fasta/loader.dart
+++ b/pkg/front_end/lib/src/fasta/loader.dart
@@ -37,7 +37,7 @@ abstract class Loader<L> {
 
   Ticker get ticker => target.ticker;
 
-  /// Look up a library builder by the the name [uri], or if such doesn't
+  /// Look up a library builder by the name [uri], or if such doesn't
   /// exist, create one. The canonical URI of the library is [uri], and its
   /// actual location is [fileUri].
   ///