Update platform-specific imports for wasm (#1051)

Fix some docs

Author: kevmoo

pkgs/flutter_http_example/lib/main.dart

@@ -11,7 +11,7 @@ import 'package:provider/provider.dart';
 
 import 'book.dart';
 import 'http_client_factory.dart'
-    if (dart.library.html) 'http_client_factory_web.dart' as http_factory;
+    if (dart.library.js_interop) 'http_client_factory_web.dart' as http_factory;
 
 void main() {
   // `runWithClient` is used to control which `package:http` `Client` is used

pkgs/http/lib/src/browser_client.dart

@@ -26,8 +26,8 @@ BaseClient createClient() {
   return BrowserClient();
 }
 
-/// A `dart:html`-based HTTP client that runs in the browser and is backed by
-/// XMLHttpRequests.
+/// A `package:web`-based HTTP client that runs in the browser and is backed by
+/// [XMLHttpRequest].
 ///
 /// This client inherits some of the limitations of XMLHttpRequest. It ignores
 /// the [BaseRequest.contentLength], [BaseRequest.persistentConnection],

pkgs/http/lib/src/client.dart

@@ -37,7 +37,8 @@ abstract interface class Client {
   /// Creates a new platform appropriate client.
   ///
   /// Creates an `IOClient` if `dart:io` is available and a `BrowserClient` if
-  /// `dart:html` is available, otherwise it will throw an unsupported error.
+  /// `dart:js_interop` is available, otherwise it will throw an unsupported
+  /// error.
   factory Client() => zoneClient ?? createClient();
 
   /// Sends an HTTP HEAD request with the given headers to the given URL.

pkgs/http_client_conformance_tests/lib/src/close_tests.dart

@@ -8,7 +8,7 @@ import 'package:stream_channel/stream_channel.dart';
 import 'package:test/test.dart';
 
 import 'request_body_server_vm.dart'
-    if (dart.library.html) 'request_body_server_web.dart';
+    if (dart.library.js_interop) 'request_body_server_web.dart';
 
 /// Tests that the [Client] correctly implements [Client.close].
 void testClose(Client Function() clientFactory) {

pkgs/http_client_conformance_tests/lib/src/compressed_response_body_tests.dart

@@ -8,7 +8,7 @@ import 'package:stream_channel/stream_channel.dart';
 import 'package:test/test.dart';
 
 import 'compressed_response_body_server_vm.dart'
-    if (dart.library.html) 'compressed_response_body_server_web.dart';
+    if (dart.library.js_interop) 'compressed_response_body_server_web.dart';
 
 /// Tests that the [Client] correctly implements HTTP responses with compressed
 /// bodies.

pkgs/http_client_conformance_tests/lib/src/isolate_test.dart

@@ -2,15 +2,15 @@
 // 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.
 
-import 'dart:isolate' if (dart.library.html) 'dummy_isolate.dart';
+import 'dart:isolate' if (dart.library.js_interop) 'dummy_isolate.dart';
 
 import 'package:async/async.dart';
 import 'package:http/http.dart';
 import 'package:stream_channel/stream_channel.dart';
 import 'package:test/test.dart';
 
 import 'request_body_server_vm.dart'
-    if (dart.library.html) 'request_body_server_web.dart';
+    if (dart.library.js_interop) 'request_body_server_web.dart';
 
 Future<void> _testPost(Client Function() clientFactory, String host) async {
   await Isolate.run(

pkgs/http_client_conformance_tests/lib/src/multiple_clients_tests.dart

@@ -8,7 +8,7 @@ import 'package:stream_channel/stream_channel.dart';
 import 'package:test/test.dart';
 
 import 'multiple_clients_server_vm.dart'
-    if (dart.library.html) 'multiple_clients_server_web.dart';
+    if (dart.library.js_interop) 'multiple_clients_server_web.dart';
 
 /// Tests that the [Client] works correctly if there are many used
 /// simultaneously.

pkgs/http_client_conformance_tests/lib/src/redirect_tests.dart

@@ -8,7 +8,7 @@ import 'package:stream_channel/stream_channel.dart';
 import 'package:test/test.dart';
 
 import 'redirect_server_vm.dart'
-    if (dart.library.html) 'redirect_server_web.dart';
+    if (dart.library.js_interop) 'redirect_server_web.dart';
 
 /// Tests that the [Client] correctly implements HTTP redirect logic.
 ///

pkgs/http_client_conformance_tests/lib/src/request_body_streamed_tests.dart

@@ -11,7 +11,7 @@ import 'package:stream_channel/stream_channel.dart';
 import 'package:test/test.dart';
 
 import 'request_body_streamed_server_vm.dart'
-    if (dart.library.html) 'request_body_streamed_server_web.dart';
+    if (dart.library.js_interop) 'request_body_streamed_server_web.dart';
 
 /// Tests that the [Client] correctly implements streamed request body
 /// uploading.

pkgs/http_client_conformance_tests/lib/src/request_body_tests.dart

@@ -10,7 +10,7 @@ import 'package:stream_channel/stream_channel.dart';
 import 'package:test/test.dart';
 
 import 'request_body_server_vm.dart'
-    if (dart.library.html) 'request_body_server_web.dart';
+    if (dart.library.js_interop) 'request_body_server_web.dart';
 
 class _Plus2Decoder extends Converter<List<int>, String> {
   @override