Remove dynamic call from _LinkedHashSet. Remove some dcalls from the dart:html util library.

pkg/dev_compiler/tool/input_sdk/lib/html/html_common/conversions_dart2js.dart

Index: pkg/dev_compiler/tool/input_sdk/lib/html/html_common/conversions_dart2js.dart
diff --git a/pkg/dev_compiler/tool/input_sdk/lib/html/html_common/conversions_dart2js.dart b/pkg/dev_compiler/tool/input_sdk/lib/html/html_common/conversions_dart2js.dart
index b5a1064554f66a1a3824700981c4e94a0a5cf06b..3cab3802cc09c358825f56c1437389af77933e79 100644
--- a/pkg/dev_compiler/tool/input_sdk/lib/html/html_common/conversions_dart2js.dart
+++ b/pkg/dev_compiler/tool/input_sdk/lib/html/html_common/conversions_dart2js.dart
@@ -60,11 +60,11 @@ class _StructuredCloneDart2Js extends _StructuredClone {
 
 class _AcceptStructuredCloneDart2Js extends _AcceptStructuredClone {
 
-  newJsList(length) => JS('JSExtendableArray', 'new Array(#)', length);
-  newDartList(length) => newJsList(length);
-  identicalInJs(a, b) => identical(a, b);
+  List newJsList(length) => JS('JSExtendableArray', 'new Array(#)', length);
+  List newDartList(length) => newJsList(length);
+  bool identicalInJs(a, b) => identical(a, b);
 
-  void forEachJsField(object, action) {
+  void forEachJsField(object, action(key, value)) {
       for (final key in JS('JSExtendableArray', 'Object.keys(#)', object)) {
         action(key, JS('var', '#[#]', object, key));

[vsm, 2017/02/01 18:37:13]

Did this change anything?  action may still be a dcall I think.

[Jacob, 2017/02/01 20:33:48]

action is not a dcall
because its signature
is 
(dynamic, dynamic) -> dynamic
The problem was action was previously type 
dynamic.

       }