Revert "Add @JSName annotation for native fields and methods."

sdk/lib/_internal/compiler/implementation/lib/js_helper.dart

Index: sdk/lib/_internal/compiler/implementation/lib/js_helper.dart
diff --git a/sdk/lib/_internal/compiler/implementation/lib/js_helper.dart b/sdk/lib/_internal/compiler/implementation/lib/js_helper.dart
index 7b046c9e48160576788e171478b5ff946933fceb..f10d3d72408a924c2bf51196010434ddaa2dc7e6 100644
--- a/sdk/lib/_internal/compiler/implementation/lib/js_helper.dart
+++ b/sdk/lib/_internal/compiler/implementation/lib/js_helper.dart
@@ -557,7 +557,7 @@ class Primitives {
       if (end <= kMaxApply) {
         subarray = array;
       } else {
-        subarray = JS('=List', r'array.slice(#, #)',
+        subarray = JS('List<int>', r'array.slice(#, #)',
                       i, i + kMaxApply < end ? i + kMaxApply : end);
       }
       result = JS('String', '# + String.fromCharCode.apply(#, #)',
@@ -1220,23 +1220,6 @@ class Returns {
 }
 
 /**
- * A metadata annotation placed on native methods and fields of native classes
- * to specify the JavaScript name.
- *
- * This example declares a Dart field + getter + setter called `$dom_title` that
- * corresponds to the JavaScript property `title`.
- *
- *     class Docmument native "*Foo" {
- *       @JSName('title')
- *       String $dom_title;
- *     }
- */
-class JSName {
-  final String name;
-  const JSName(this.name);
-}
-
-/**
  * Represents the type of Null. The compiler treats this specially.
  * TODO(lrn): Null should be defined in core. It's a class, like int.
  * It just happens to act differently in assignability tests and,