Remove deprecated code

lib/js/es6/dart_sdk.js

Index: lib/js/es6/dart_sdk.js
diff --git a/lib/js/es6/dart_sdk.js b/lib/js/es6/dart_sdk.js
index 1a0e06801350530f76db1de167f8b376176f8c6c..b791cf2892e5d80041cbd38d885482ed4fa1a962 100644
--- a/lib/js/es6/dart_sdk.js
+++ b/lib/js/es6/dart_sdk.js
@@ -660,7 +660,6 @@ let GeopositionTovoid = () => (GeopositionTovoid = dart.constFn(dart.definiteFun
 let PositionErrorTovoid = () => (PositionErrorTovoid = dart.constFn(dart.definiteFunctionType(dart.void, [html.PositionError])))();
 let HttpRequestToString = () => (HttpRequestToString = dart.constFn(dart.definiteFunctionType(core.String, [html.HttpRequest])))();
 let ProgressEventTovoid = () => (ProgressEventTovoid = dart.constFn(dart.definiteFunctionType(dart.void, [html.ProgressEvent])))();
-let HttpRequestTodynamic = () => (HttpRequestTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [html.HttpRequest])))();
 let ListOfSourceInfoTovoid = () => (ListOfSourceInfoTovoid = dart.constFn(dart.definiteFunctionType(dart.void, [ListOfSourceInfo()])))();
 let MediaStreamTovoid = () => (MediaStreamTovoid = dart.constFn(dart.definiteFunctionType(dart.void, [html.MediaStream])))();
 let NavigatorUserMediaErrorTovoid = () => (NavigatorUserMediaErrorTovoid = dart.constFn(dart.definiteFunctionType(dart.void, [html.NavigatorUserMediaError])))();
@@ -16572,7 +16571,7 @@ async.Future$ = dart.flattenFutures(dart.generic(T => {
       let iterator = input[dartx.iterator];
       return async.Future.doWhile(dart.fn(() => {
         if (!dart.test(iterator.moveNext())) return false;
-        return async.Future.sync(dart.fn(() => dart.dcall(f, iterator.current), VoidTodynamic())).then(dart.dynamic)(dart.fn(_ => true, dynamicTobool()));
+        return async.Future.sync(dart.fn(() => dart.dcall(f, iterator.current), VoidTodynamic())).then(core.bool)(dart.fn(_ => true, dynamicTobool()));
       }, VoidToObject()));
     }
     static doWhile(f) {
@@ -54285,7 +54284,7 @@ html.HttpRequest = class HttpRequest extends html.HttpRequestEventTarget {
     let method = opts && 'method' in opts ? opts.method : null;
     let sendData = opts && 'sendData' in opts ? opts.sendData : null;
     if (dart.test(html.HttpRequest.supportsCrossOrigin)) {
-      return html.HttpRequest.request(url, {method: method, sendData: sendData}).then(core.String)(dart.fn(xhr => xhr[dartx.responseText], HttpRequestTodynamic()));
+      return html.HttpRequest.request(url, {method: method, sendData: sendData}).then(core.String)(dart.fn(xhr => xhr[dartx.responseText], HttpRequestToString()));
     }
     let completer = CompleterOfString().new();
     if (method == null) {