Revert "This change makes it easier to put type parameters on JavaScript Arrays."

tests/utils/dummy_compiler_test.dart

Index: tests/utils/dummy_compiler_test.dart
diff --git a/tests/utils/dummy_compiler_test.dart b/tests/utils/dummy_compiler_test.dart
index aad4e497c04d4a6f7348b50f0d2ab305406c5a6f..4c0a4aa9d1d8c268d9a48098f250ae5c8dcbb49c 100644
--- a/tests/utils/dummy_compiler_test.dart
+++ b/tests/utils/dummy_compiler_test.dart
@@ -32,7 +32,7 @@ class int {}
 class double{}
 class String{}
 class Function{}
-class List<E> {}
+class List {}
 class Map {}
 class Closure {}
 class BoundClosure {}
@@ -57,9 +57,7 @@ class JSIndexable {
   get length;
 }
 class JSMutableIndexable {}
-class JSArray<E> implements JSIndexable {
-  JSArray() {}
-  factory JSArray.typed(a) => a;
+class JSArray implements JSIndexable {
   var removeLast;
   var add;
 }