Remove SendPortSync and ReceivePortSync.

third_party/pkg/js/README.md

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-Dart JavaScript Interop
-===================
-
-The js.dart library allows Dart code running in the browser to
-manipulate JavaScript running in the same page.  It is intended to
-allow Dart code to easily interact with third-party JavaScript libraries.
-
-Documentation
--------------
-
-See [API documentation][docs]. You should also watch this [video tutorial][video].
-
-Samples
--------
-
-See [samples][samples] that demonstrate interaction with JavaScript
-code.  These include interoperation with the Google Maps JavaScript
-library, the Google Visualization JavaScript library, and Twitter's
-query API via JSONP.
-
-Usage
------
-
-The [Dart Editor][editor] now includes pub support.  To try out this
-library in the editor:
-
-1.  [Update to the latest editor][editor].
-
-2.  From the "File" menu, open a "New Application" (and make sure "Add
-        Pub support" is checked).
-
-3.  Add the following to your pubspec.yaml:
-
-        dependencies:
-          js: any
-
-
-4.  Under the "Tools" menu, run "Pub Install".
-
-5.  Try the following test Dart file:
-
-        import 'package:js/js.dart' as js;
-        
-        void main() {
-          js.context.alert('Hello from Dart via JS');
-        }
-        
-6.  Add the script to your HTML page:
-
-        <script src="packages/browser/dart.js"></script>
-        <script src="packages/browser/interop.js"></script> 
-
-Running Tests
--------------
-
-First, use the [Pub Package Manager][pub] to install dependencies:
-
-    pub install
-
-To run browser tests on [Dartium], simply open **test/browser_tests.html**
-in Dartium.
-
-To run browser tests using JavaScript in any modern browser, first use the
-following command to compile to JavaScript:
-
-    dart2js -otest/browser_tests.dart.js test/browser_tests.dart
-
-and then open **test/browser_tests.html** in any browser.
-
-[d]: http://www.dartlang.org
-[mb]: http://www.dartlang.org/support/faq.html#what-browsers-supported
-[pub]: http://www.dartlang.org/docs/pub-package-manager/
-[Dartium]: http://www.dartlang.org/dartium/index.html
-[docs]: http://dart-lang.github.com/js-interop
-[samples]: http://dart-lang.github.com/js-interop/example
-[editor]: http://www.dartlang.org/docs/editor/getting-started/
-[video]: http://www.youtube.com/watch?v=QFuCFUd2Zsw