Only re-export the main methods. The ddc codegen doesn't depend on any other methods being exported…

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 44083b71c66cc5faf7f145bbdd4e9b83a6df8176..a0eb5ef14ef97cf7b4e0684cbc70ee2c5e855085 100644
--- a/pkg/dev_compiler/lib/js/es6/dart_sdk.js
+++ b/pkg/dev_compiler/lib/js/es6/dart_sdk.js
@@ -83131,15 +83131,6 @@ dart.setSignature(html._ValidatingTreeSanitizer, {
     sanitizeNode: dart.definiteFunctionType(dart.void, [html.Node, html.Node])
   })
 });
-html.Point$ = math.Point$;
-html.Point = math.Point;
-html.Rectangle$ = math.Rectangle$;
-html.Rectangle = math.Rectangle;
-html_common.SupportedBrowser = _metadata.SupportedBrowser;
-html_common.Unstable = _metadata.Unstable;
-html_common.DocsEditable = _metadata.DocsEditable;
-html_common.Experimental = _metadata.Experimental;
-html_common.DomName = _metadata.DomName;
 html_common.convertDartToNative_SerializedScriptValue = function(value) {
   return html_common.convertDartToNative_PrepareForStructuredClone(value);
 };