Remove JS_CONST from CssStyleDeclaration, causes DDC problems

sdk/lib/html/dart2js/html_dart2js.dart

Index: sdk/lib/html/dart2js/html_dart2js.dart
diff --git a/sdk/lib/html/dart2js/html_dart2js.dart b/sdk/lib/html/dart2js/html_dart2js.dart
index 96bd663d3fbb568d122317cf4f31993f954e8593..aa2ebac81505583b45006581dd26eb3e399ccbed 100644
--- a/sdk/lib/html/dart2js/html_dart2js.dart
+++ b/sdk/lib/html/dart2js/html_dart2js.dart
@@ -42,7 +42,7 @@ import 'dart:web_gl' as gl;
 import 'dart:web_gl' show RenderingContext;
 import 'dart:web_sql';
 import 'dart:_isolate_helper' show IsolateNatives;
-import 'dart:_foreign_helper' show JS, JS_INTERCEPTOR_CONSTANT, JS_CONST;
+import 'dart:_foreign_helper' show JS, JS_INTERCEPTOR_CONSTANT;
 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
@@ -135,7 +135,6 @@ createCustomUpgrader(Type customElementClass, $this) => $this;
 @Experimental() // untriaged
 typedef void FontFaceSetForEachCallback(
     FontFace fontFace, FontFace fontFaceAgain, FontFaceSet set);
-
 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
@@ -4359,7 +4358,7 @@ class CssStyleDeclaration extends Interceptor with CssStyleDeclarationBase {
     var replacedMs = JS('String', r'#.replace(/^-ms-/, "ms-")', hyphenated);
 
     var fToUpper =
-        const JS_CONST(r'function(_, letter) { return letter.toUpperCase(); }');
+        JS('', r'function(_, letter) { return letter.toUpperCase(); }');
     return JS('String', r'#.replace(/-([\da-z])/ig, #)', replacedMs, fToUpper);
   }