dart2js: Don't emit fields that are named "eval" or "arguments".

pkg/compiler/lib/src/js_backend/namer.dart

Index: pkg/compiler/lib/src/js_backend/namer.dart
diff --git a/pkg/compiler/lib/src/js_backend/namer.dart b/pkg/compiler/lib/src/js_backend/namer.dart
index 36663d9704d1d7c2667ce9b410625bbf8af7eb8e..28f8e5a2e45c2405e77deae7ed128bc8ba6d24a6 100644
--- a/pkg/compiler/lib/src/js_backend/namer.dart
+++ b/pkg/compiler/lib/src/js_backend/namer.dart
@@ -25,7 +25,12 @@ class Namer implements ClosureNamer {
   ];
 
   static const reservedPropertySymbols =
-      const <String>["__proto__", "prototype", "constructor", "call"];
+      const <String>[
+        "__proto__", "prototype", "constructor", "call",
+        // "use strict" disallows the use of "arguments" and "eval" as
+        // variable names or property names. See ECMA-262, Edition 5.1,
+        // section 11.1.5 (for the property names).
+        "eval", "arguments"];
 
   // Symbols that we might be using in our JS snippets.
   static const reservedGlobalSymbols = const <String>[