fix all instances of "the the"

sdk/lib/_internal/js_runtime/lib/collection_patch.dart

Index: sdk/lib/_internal/js_runtime/lib/collection_patch.dart
diff --git a/sdk/lib/_internal/js_runtime/lib/collection_patch.dart b/sdk/lib/_internal/js_runtime/lib/collection_patch.dart
index 7d15ab839a1525e86739210c84820b533b570283..beb67f242d1d6437db5aee3cda1d6bdb95ef2725 100644
--- a/sdk/lib/_internal/js_runtime/lib/collection_patch.dart
+++ b/sdk/lib/_internal/js_runtime/lib/collection_patch.dart
@@ -839,7 +839,7 @@ class _HashSet<E> extends _HashSetBase<E> implements HashSet<E> {
 
   // When iterating over the hash set, it is very convenient to have a
   // list of all the elements. We cache that on the instance and clear
-  // the the cache whenever the set changes. This is also used to
+  // the cache whenever the set changes. This is also used to
   // guard against concurrent modifications.
   List _elements;