Move implementation from IterableBase to Iterable.

runtime/vm/debugger_api_impl_test.cc

Index: runtime/vm/debugger_api_impl_test.cc
diff --git a/runtime/vm/debugger_api_impl_test.cc b/runtime/vm/debugger_api_impl_test.cc
index e8df08800827ff411afe505fd865d3a901d973dc..4bbc7e8f4964200c1cfad5fe92456227c47cf2ef 100644
--- a/runtime/vm/debugger_api_impl_test.cc
+++ b/runtime/vm/debugger_api_impl_test.cc
@@ -2147,7 +2147,7 @@ TEST_CASE(Debug_GetSupertype) {
   Dart_Handle object_name = Dart_NewStringFromCString("Object");
   Dart_Handle int_name = Dart_NewStringFromCString("int");
   Dart_Handle set_name = Dart_NewStringFromCString("Set");
-  Dart_Handle iterable_name = Dart_NewStringFromCString("IterableBase");
+  Dart_Handle iterable_name = Dart_NewStringFromCString("Iterable");
   Dart_Handle list_name = Dart_NewStringFromCString("List");
 
   Dart_Handle object_type = Dart_GetType(core_lib, object_name, 0, NULL);