Removed fixed dependencies

packages/usage/lib/src/usage_impl_html.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
+library usage_impl_html;
+
 import 'dart:async';
 import 'dart:convert' show JSON;
 import 'dart:html';
 
 import 'usage_impl.dart';
 
-/// An interface to a Google Analytics session, suitable for use in web apps.
-///
-/// [analyticsUrl] is an optional replacement for the default Google Analytics
-/// URL (`https://www.google-analytics.com/collect`).
-class AnalyticsHtml extends AnalyticsImpl {
-  AnalyticsHtml(
-      String trackingId, String applicationName, String applicationVersion,
-      {String analyticsUrl})
-      : super(trackingId, new HtmlPersistentProperties(applicationName),
-            new HtmlPostHandler(),
-            applicationName: applicationName,
-            applicationVersion: applicationVersion,
-            analyticsUrl: analyticsUrl) {
-    int screenWidth = window.screen.width;
-    int screenHeight = window.screen.height;
+class HtmlPostHandler extends PostHandler {
+  final Function mockRequestor;
 
-    setSessionValue('sr', '${screenWidth}x$screenHeight');
-    setSessionValue('sd', '${window.screen.pixelDepth}-bits');
-    setSessionValue('ul', window.navigator.language);
-  }
-}
+  HtmlPostHandler({Function this.mockRequestor});
 
-typedef Future<HttpRequest> HttpRequestor(String url,
-    {String method, sendData});
-
-class HtmlPostHandler extends PostHandler {
-  final HttpRequestor mockRequestor;
-
-  HtmlPostHandler({this.mockRequestor});
-
-  @override
   Future sendPost(String url, Map<String, dynamic> parameters) {
     int viewportWidth = document.documentElement.clientWidth;
     int viewportHeight = document.documentElement.clientHeight;
 
     parameters['vp'] = '${viewportWidth}x$viewportHeight';
 
     String data = postEncode(parameters);
-    HttpRequestor requestor =
-        mockRequestor == null ? HttpRequest.request : mockRequestor;
-    return requestor(url, method: 'POST', sendData: data).catchError((e) {
+    var request = mockRequestor == null ? HttpRequest.request : mockRequestor;
+    return request(url, method: 'POST', sendData: data).catchError((e) {
       // Catch errors that can happen during a request, but that we can't do
-      // anything about, e.g. a missing internet connection.
+      // anything about, e.g. a missing internet conenction.
     });
   }
-
-  @override
-  void close() {}
 }
 
 class HtmlPersistentProperties extends PersistentProperties {
   Map _map;
 
   HtmlPersistentProperties(String name) : super(name) {
     String str = window.localStorage[name];
     if (str == null || str.isEmpty) str = '{}';
     _map = JSON.decode(str);
   }
 
-  @override
-  dynamic operator [](String key) => _map[key];
+  dynamic operator[](String key) => _map[key];
 
-  @override
-  void operator []=(String key, dynamic value) {
+  void operator[]=(String key, dynamic value) {
     if (value == null) {
       _map.remove(key);
     } else {
       _map[key] = value;
     }
 
     window.localStorage[name] = JSON.encode(_map);
   }
-
-  @override
-  void syncSettings() {}
 }