Fix some errors around []= in core types.

pkg/dev_compiler/tool/sdk_expected_errors.txt

Index: pkg/dev_compiler/tool/sdk_expected_errors.txt
diff --git a/pkg/dev_compiler/tool/sdk_expected_errors.txt b/pkg/dev_compiler/tool/sdk_expected_errors.txt
index a7b684df1b69626181c5ccccb446c759aa01b441..9b7f9e95086546fb267854c0d00923eb6df3ffd1 100644
--- a/pkg/dev_compiler/tool/sdk_expected_errors.txt
+++ b/pkg/dev_compiler/tool/sdk_expected_errors.txt
@@ -1,24 +1,8 @@
-[error] Base class introduces an invalid override. The type of JSArray.[]= ((int, E) → void) is not a subtype of JSMutableIndexable.[]= ((int, dynamic) → dynamic). (dart:_interceptors/js_array.dart, line 590, col 25)
-[error] Invalid override. The type of NativeTypedArrayOfDouble.[]= ((int, num) → void) is not a subtype of JSMutableIndexable.[]= ((int, dynamic) → dynamic). (dart:_native_typed_data, line 793, col 3)
 [error] Could not infer type parameter T, _ControllerEventSinkWrapper<dynamic> must be of type EventSink<T>. (dart:async/stream.dart, line 1346, col 16)
 [error] The argument type '_ControllerEventSinkWrapper' cannot be assigned to the parameter type 'EventSink<T>'. (dart:async/stream.dart, line 1346, col 53)
 [error] Invalid override. The type of ChunkedConverter.bind ((dynamic) → dynamic) is not a subtype of Converter<S, T>.bind ((Stream<S>) → Stream<T>). (dart:convert/chunked_conversion.dart, line 14, col 3)
 [error] Invalid override. The type of ChunkedConverter.bind ((dynamic) → dynamic) is not a subtype of StreamTransformer<S, T>.bind ((Stream<S>) → Stream<T>). (dart:convert/chunked_conversion.dart, line 14, col 3)
 [error] Invalid override. The type of ChunkedConverter.startChunkedConversion ((dynamic) → dynamic) is not a subtype of Converter<S, T>.startChunkedConversion ((Sink<T>) → Sink<S>). (dart:convert/chunked_conversion.dart, line 15, col 3)
-[error] Invalid override. The type of FileList.[]= ((int, File) → void) is not a subtype of JSMutableIndexable.[]= ((int, dynamic) → dynamic). (dart:html, line 16868, col 3)
-[error] Invalid override. The type of HtmlCollection.[]= ((int, Node) → void) is not a subtype of JSMutableIndexable.[]= ((int, dynamic) → dynamic). (dart:html, line 18903, col 3)
-[error] Invalid override. The type of MimeTypeArray.[]= ((int, MimeType) → void) is not a subtype of JSMutableIndexable.[]= ((int, dynamic) → dynamic). (dart:html, line 23817, col 3)
-[error] Invalid override. The type of NodeList.[]= ((int, Node) → void) is not a subtype of JSMutableIndexable.[]= ((int, dynamic) → dynamic). (dart:html, line 25466, col 3)
-[error] Invalid override. The type of PluginArray.[]= ((int, Plugin) → void) is not a subtype of JSMutableIndexable.[]= ((int, dynamic) → dynamic). (dart:html, line 26970, col 3)
-[error] Invalid override. The type of SourceBufferList.[]= ((int, SourceBuffer) → void) is not a subtype of JSMutableIndexable.[]= ((int, dynamic) → dynamic). (dart:html, line 30208, col 3)
-[error] Invalid override. The type of SpeechGrammarList.[]= ((int, SpeechGrammar) → void) is not a subtype of JSMutableIndexable.[]= ((int, dynamic) → dynamic). (dart:html, line 30409, col 3)
-[error] Invalid override. The type of TextTrackList.[]= ((int, TextTrack) → void) is not a subtype of JSMutableIndexable.[]= ((int, dynamic) → dynamic). (dart:html, line 32568, col 3)
-[error] Invalid override. The type of TouchList.[]= ((int, Touch) → void) is not a subtype of JSMutableIndexable.[]= ((int, dynamic) → dynamic). (dart:html, line 32903, col 3)
-[error] Invalid override. The type of _CssRuleList.[]= ((int, CssRule) → void) is not a subtype of JSMutableIndexable.[]= ((int, dynamic) → dynamic). (dart:html, line 37674, col 3)
-[error] Invalid override. The type of _GamepadList.[]= ((int, Gamepad) → void) is not a subtype of JSMutableIndexable.[]= ((int, dynamic) → dynamic). (dart:html, line 37928, col 3)
-[error] Invalid override. The type of _NamedNodeMap.[]= ((int, Node) → void) is not a subtype of JSMutableIndexable.[]= ((int, dynamic) → dynamic). (dart:html, line 38135, col 3)
-[error] Invalid override. The type of _SpeechRecognitionResultList.[]= ((int, SpeechRecognitionResult) → void) is not a subtype of JSMutableIndexable.[]= ((int, dynamic) → dynamic). (dart:html, line 38351, col 3)
-[error] Invalid override. The type of _StyleSheetList.[]= ((int, StyleSheet) → void) is not a subtype of JSMutableIndexable.[]= ((int, dynamic) → dynamic). (dart:html, line 38415, col 3)
 [error] Invalid override. The type of _EventStreamSubscription.asFuture (([dynamic]) → Future<dynamic>) is not a subtype of StreamSubscription<T>.asFuture (<E>([E]) → Future<E>). (dart:html, line 40152, col 3)
 [error] Invalid override. The type of JsArray.[]= ((Object, E) → void) is not a subtype of JsObject.[]= ((Object, dynamic) → dynamic). (dart:js, line 363, col 3)
 [error] The return type 'double' is not a 'T', as defined by the method 'min'. (dart:math, line 90, col 16)