Use an enum in embedded_names as input to JS_GET_NAME.

sdk/lib/_internal/compiler/js_lib/foreign_helper.dart

Index: sdk/lib/_internal/compiler/js_lib/foreign_helper.dart
diff --git a/sdk/lib/_internal/compiler/js_lib/foreign_helper.dart b/sdk/lib/_internal/compiler/js_lib/foreign_helper.dart
index 96fd0a56cba7020bec187ef598802574bc4f5b72..8a400f82bf2496bb4771caec3c984b9aeceb24f7 100644
--- a/sdk/lib/_internal/compiler/js_lib/foreign_helper.dart
+++ b/sdk/lib/_internal/compiler/js_lib/foreign_helper.dart
@@ -4,6 +4,8 @@
 
 library _foreign_helper;
 
+import 'dart:_js_embedded_names' show JsGetName;
+
 /**
  * Emits a JavaScript code fragment parameterized by arguments.
  *
@@ -240,7 +242,7 @@ String JS_FUNCTION_TYPE_OPTIONAL_PARAMETERS_TAG() {}
 String JS_FUNCTION_TYPE_NAMED_PARAMETERS_TAG() {}
 
 /// Returns the JS name for [name] from the Namer.
-String JS_GET_NAME(String name) {}
+String JS_GET_NAME(JsGetName name) {}
 
 /// Reads an embedded global.
 ///