fix #27408, reverts "ignore dynamic in inference"

pkg/dev_compiler/lib/js/es6/dart_sdk.js

Index: pkg/dev_compiler/lib/js/es6/dart_sdk.js
diff --git a/pkg/dev_compiler/lib/js/es6/dart_sdk.js b/pkg/dev_compiler/lib/js/es6/dart_sdk.js
index 79335090e7a63bc5a99d81910d1436acecc3b73f..26c6bd264b2a6c3f87e48186ec444c710969e526 100644
--- a/pkg/dev_compiler/lib/js/es6/dart_sdk.js
+++ b/pkg/dev_compiler/lib/js/es6/dart_sdk.js
@@ -660,7 +660,6 @@ let dynamicAnddynamicTobool = () => (dynamicAnddynamicTobool = dart.constFn(dart
 let IterableAndListTovoid = () => (IterableAndListTovoid = dart.constFn(dart.definiteFunctionType(dart.void, [core.Iterable, core.List])))();
 let _SplayTreeMapNodeTobool = () => (_SplayTreeMapNodeTobool = dart.constFn(dart.definiteFunctionType(core.bool, [collection._SplayTreeMapNode])))();
 let dynamicAndFnTodynamic = () => (dynamicAndFnTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [dart.dynamic, dynamicAnddynamicTodynamic()])))();
-let StringBufferToString = () => (StringBufferToString = dart.constFn(dart.definiteFunctionType(core.String, [core.StringBuffer])))();
 let Uint8ListAndintAndintTovoid = () => (Uint8ListAndintAndintTovoid = dart.constFn(dart.definiteFunctionType(dart.void, [typed_data.Uint8List, core.int, core.int])))();
 let StringAndFnTodynamic = () => (StringAndFnTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [core.String, dynamicAnddynamicTodynamic()])))();
 let EventSinkOfStringTo_LineSplitterEventSink = () => (EventSinkOfStringTo_LineSplitterEventSink = dart.constFn(dart.definiteFunctionType(convert._LineSplitterEventSink, [EventSinkOfString()])))();
@@ -8689,7 +8688,7 @@ _isolate_helper._Manager = class _Manager extends core.Object {
     })(_isolate_helper._Manager._serializePrintMessage);
   }
   static _serializePrintMessage(object) {
-    return _isolate_helper._serializeMessage(dart.map({command: "print", msg: core.String._check(object)}, core.String, core.String));
+    return _isolate_helper._serializeMessage(dart.map({command: "print", msg: object}, core.String, dart.dynamic));
   }
   maybeCloseWorker() {
     if (dart.test(this.isWorker) && dart.test(this.isolates[dartx.isEmpty]) && this.topEventLoop[_activeJsAsyncCount] == 0) {
@@ -9248,7 +9247,7 @@ _isolate_helper.IsolateNatives = class IsolateNatives extends core.Object {
       case 'print':
       {
         if (dart.test(_isolate_helper._globalState.isWorker)) {
-          _isolate_helper._globalState.mainManager.postMessage(_isolate_helper._serializeMessage(dart.map({command: 'print', msg: core.String._check(msg)}, core.String, core.String)));
+          _isolate_helper._globalState.mainManager.postMessage(_isolate_helper._serializeMessage(dart.map({command: 'print', msg: msg}, core.String, dart.dynamic)));
         } else {
           core.print(dart.dindex(msg, 'msg'));
         }
@@ -9270,7 +9269,7 @@ _isolate_helper.IsolateNatives = class IsolateNatives extends core.Object {
   }
   static _log(msg) {
     if (dart.test(_isolate_helper._globalState.isWorker)) {
-      _isolate_helper._globalState.mainManager.postMessage(_isolate_helper._serializeMessage(dart.map({command: 'log', msg: core.String._check(msg)}, core.String, core.String)));
+      _isolate_helper._globalState.mainManager.postMessage(_isolate_helper._serializeMessage(dart.map({command: 'log', msg: msg}, core.String, dart.dynamic)));
     } else {
       try {
         _isolate_helper.IsolateNatives._consoleLog(msg);
@@ -10666,7 +10665,7 @@ _isolate_helper._Serializer = class _Serializer extends core.Object {
     let fieldsExtractor = _foreign_helper.JS_EMBEDDED_GLOBAL('', _js_embedded_names.CLASS_FIELDS_EXTRACTOR);
     let classId = classExtractor(x);
     let fields = fieldsExtractor(x);
-    return JSArrayOfString().of(['dart', classId, core.String._check(this.serializeArrayInPlace(_interceptors.JSArray._check(fields)))]);
+    return ['dart', classId, this.serializeArrayInPlace(_interceptors.JSArray._check(fields))];
   }
 };
 dart.setSignature(_isolate_helper._Serializer, {
@@ -28896,10 +28895,10 @@ convert.Encoding = class Encoding extends convert.Codec$(core.String, core.List$
     super.new();
   }
   decodeStream(byteStream) {
-    return byteStream.transform(core.String)(this.decoder).fold(core.StringBuffer)(new core.StringBuffer(), dart.fn((buffer, string) => ((() => {
+    return byteStream.transform(core.String)(this.decoder).fold(dart.dynamic)(new core.StringBuffer(), dart.fn((buffer, string) => ((() => {
       dart.dsend(buffer, 'write', string);
       return buffer;
-    })()), dynamicAndStringTodynamic())).then(core.String)(dart.fn(buffer => dart.toString(buffer), StringBufferToString()));
+    })()), dynamicAndStringTodynamic())).then(core.String)(dart.fn(buffer => dart.toString(buffer), dynamicToString()));
   }
   static getByName(name) {
     if (name == null) return null;
@@ -28961,12 +28960,11 @@ convert._ASCII_MASK = 127;
 const _subsetMask = Symbol('_subsetMask');
 convert.Converter$ = dart.generic((S, T) => {
   let StreamOfS = () => (StreamOfS = dart.constFn(async.Stream$(S)))();
-  let _ConverterStreamEventSinkOfS$T = () => (_ConverterStreamEventSinkOfS$T = dart.constFn(convert._ConverterStreamEventSink$(S, T)))();
+  let _ConverterStreamEventSinkOfS$dynamic = () => (_ConverterStreamEventSinkOfS$dynamic = dart.constFn(convert._ConverterStreamEventSink$(S, dart.dynamic)))();
   let StreamTransformerOfS$T = () => (StreamTransformerOfS$T = dart.constFn(async.StreamTransformer$(S, T)))();
   let SinkOfT = () => (SinkOfT = dart.constFn(core.Sink$(T)))();
   let StreamOfT = () => (StreamOfT = dart.constFn(async.Stream$(T)))();
-  let EventSinkOfT = () => (EventSinkOfT = dart.constFn(async.EventSink$(T)))();
-  let EventSinkTo_ConverterStreamEventSinkOfS$T = () => (EventSinkTo_ConverterStreamEventSinkOfS$T = dart.constFn(dart.definiteFunctionType(_ConverterStreamEventSinkOfS$T(), [async.EventSink])))();
+  let EventSinkTo_ConverterStreamEventSinkOfS$dynamic = () => (EventSinkTo_ConverterStreamEventSinkOfS$dynamic = dart.constFn(dart.definiteFunctionType(_ConverterStreamEventSinkOfS$dynamic(), [async.EventSink])))();
   class Converter extends core.Object {
     new() {
     }
@@ -28982,7 +28980,7 @@ convert.Converter$ = dart.generic((S, T) => {
     }
     bind(stream) {
       StreamOfS()._check(stream);
-      return StreamOfT().eventTransformed(stream, dart.fn(sink => new (_ConverterStreamEventSinkOfS$T())(this, EventSinkOfT()._check(sink)), EventSinkTo_ConverterStreamEventSinkOfS$T()));
+      return StreamOfT().eventTransformed(stream, dart.fn(sink => new (_ConverterStreamEventSinkOfS$dynamic())(this, sink), EventSinkTo_ConverterStreamEventSinkOfS$dynamic()));
     }
   }
   dart.addTypeTests(Converter);