Fix all dart:html strong mode errors except for spurious FINAL_NOT_INITIALIZED_CONSTRUCTOR warnings.

lib/runtime/dart/html_common.js

Index: lib/runtime/dart/html_common.js
diff --git a/lib/runtime/dart/html_common.js b/lib/runtime/dart/html_common.js
index 3fe18bd010d51582839df3caa0c94f69a34ce0ef..9968c81fe108ca0b88a6fe4e869e0fd921fac1bd 100644
--- a/lib/runtime/dart/html_common.js
+++ b/lib/runtime/dart/html_common.js
@@ -7,11 +7,9 @@ dart_library.library('dart/html_common', null, /* Imports */[
   'dart/_js_helper',
   'dart/_native_typed_data',
   'dart/async',
-  'dart/_internal',
   'dart/collection'
 ], /* Lazy imports */[
-  'dart/web_gl'
-], function(exports, dart, _metadata, core, html, typed_data, _js_helper, _native_typed_data, async, _internal, collection, web_gl) {
+], function(exports, dart, _metadata, core, html, typed_data, _js_helper, _native_typed_data, async, collection) {
   'use strict';
   let dartx = dart.dartx;
   dart.export(exports, _metadata);
@@ -109,7 +107,7 @@ dart_library.library('dart/html_common', null, /* Imports */[
       this.modify(dart.fn(s => s.addAll(iterable[dartx.map](dart.bind(this, _validateToken))), dart.void, [core.Set$(core.String)]));
     }
     removeAll(iterable) {
-      this.modify(dart.fn(s => s.removeAll(iterable[dartx.map](dart.as(dart.bind(this, _validateToken), dart.functionType(core.String, [core.Object])))), dart.void, [core.Set$(core.String)]));
+      this.modify(dart.fn(s => s.removeAll(iterable), dart.void, [core.Set$(core.String)]));
     }
     toggleAll(iterable, shouldAdd) {
       if (shouldAdd === void 0) shouldAdd = null;
@@ -215,7 +213,7 @@ dart_library.library('dart/html_common', null, /* Imports */[
       containsAll: [core.bool, [core.Iterable$(core.Object)]],
       intersection: [core.Set$(core.String), [core.Set$(core.Object)]],
       union: [core.Set$(core.String), [core.Set$(core.String)]],
-      difference: [core.Set$(core.String), [core.Set$(core.String)]],
+      difference: [core.Set$(core.String), [core.Set$(core.Object)]],
       toList: [core.List$(core.String), [], {growable: core.bool}],
       toSet: [core.Set$(core.String), []],
       take: [core.Iterable$(core.String), [core.int]],
@@ -430,8 +428,8 @@ dart_library.library('dart/html_common', null, /* Imports */[
       convertNativeToDart_AcceptStructuredClone: [dart.dynamic, [dart.dynamic], {mustCopy: dart.dynamic}]
     })
   });
-  class _TypedContextAttributes extends core.Object {
-    _TypedContextAttributes(alpha, antialias, depth, failIfMajorPerformanceCaveat, premultipliedAlpha, preserveDrawingBuffer, stencil) {
+  class ContextAttributes extends core.Object {
+    ContextAttributes(alpha, antialias, depth, failIfMajorPerformanceCaveat, premultipliedAlpha, preserveDrawingBuffer, stencil) {
       this.alpha = alpha;
       this.antialias = antialias;
       this.depth = depth;
@@ -441,33 +439,13 @@ dart_library.library('dart/html_common', null, /* Imports */[
       this.stencil = stencil;
     }
   }
-  _TypedContextAttributes[dart.implements] = () => [web_gl.ContextAttributes];
-  dart.setSignature(_TypedContextAttributes, {
-    constructors: () => ({_TypedContextAttributes: [_TypedContextAttributes, [core.bool, core.bool, core.bool, core.bool, core.bool, core.bool, core.bool]]})
+  dart.setSignature(ContextAttributes, {
+    constructors: () => ({ContextAttributes: [ContextAttributes, [core.bool, core.bool, core.bool, core.bool, core.bool, core.bool, core.bool]]})
   });
-  dart.defineExtensionMembers(_TypedContextAttributes, [
-    'alpha',
-    'alpha',
-    'antialias',
-    'antialias',
-    'depth',
-    'depth',
-    'premultipliedAlpha',
-    'premultipliedAlpha',
-    'preserveDrawingBuffer',
-    'preserveDrawingBuffer',
-    'stencil',
-    'stencil',
-    'failIfMajorPerformanceCaveat',
-    'failIfMajorPerformanceCaveat'
-  ]);
   function convertNativeToDart_ContextAttributes(nativeContextAttributes) {
-    if (dart.is(nativeContextAttributes, web_gl.ContextAttributes)) {
-      return nativeContextAttributes;
-    }
-    return new _TypedContextAttributes(dart.as(nativeContextAttributes.alpha, core.bool), dart.as(nativeContextAttributes.antialias, core.bool), dart.as(nativeContextAttributes.depth, core.bool), dart.as(nativeContextAttributes.failIfMajorPerformanceCaveat, core.bool), dart.as(nativeContextAttributes.premultipliedAlpha, core.bool), dart.as(nativeContextAttributes.preserveDrawingBuffer, core.bool), dart.as(nativeContextAttributes.stencil, core.bool));
+    return new ContextAttributes(dart.as(nativeContextAttributes.alpha, core.bool), dart.as(nativeContextAttributes.antialias, core.bool), dart.as(nativeContextAttributes.depth, core.bool), dart.as(nativeContextAttributes.failIfMajorPerformanceCaveat, core.bool), dart.as(nativeContextAttributes.premultipliedAlpha, core.bool), dart.as(nativeContextAttributes.preserveDrawingBuffer, core.bool), dart.as(nativeContextAttributes.stencil, core.bool));
   }
-  dart.fn(convertNativeToDart_ContextAttributes, () => dart.definiteFunctionType(web_gl.ContextAttributes, [dart.dynamic]));
+  dart.fn(convertNativeToDart_ContextAttributes);
   class _TypedImageData extends core.Object {
     _TypedImageData(data, height, width) {
       this.data = data;
@@ -635,14 +613,6 @@ dart_library.library('dart/html_common', null, /* Imports */[
     return completer.future;
   }
   dart.fn(convertNativePromiseToDartFuture, async.Future, [dart.dynamic]);
-  function wrap_jso(jsObject) {
-    return jsObject;
-  }
-  dart.fn(wrap_jso);
-  function unwrap_jso(dartClass_instance) {
-    return dartClass_instance;
-  }
-  dart.fn(unwrap_jso);
   class Device extends core.Object {
     static get userAgent() {
       return html.window[dartx.navigator][dartx.userAgent];
@@ -729,7 +699,7 @@ dart_library.library('dart/html_common', null, /* Imports */[
       this[_node] = node;
     }
     get [_iterable]() {
-      return new (_internal.WhereIterable$(html.Element))(this[_childNodes], dart.fn(n => dart.is(n, html.Element), core.bool, [html.Element]));
+      return this[_childNodes][dartx.where](dart.fn(n => dart.is(n, html.Element), core.bool, [html.Node]))[dartx.map](dart.fn(n => dart.as(n, html.Element), html.Element, [html.Node]));
     }
     get [_filtered]() {
       return core.List$(html.Element).from(this[_iterable], {growable: false});
@@ -931,6 +901,7 @@ dart_library.library('dart/html_common', null, /* Imports */[
   exports.CssClassSetImpl = CssClassSetImpl;
   exports.convertDartToNative_SerializedScriptValue = convertDartToNative_SerializedScriptValue;
   exports.convertNativeToDart_SerializedScriptValue = convertNativeToDart_SerializedScriptValue;
+  exports.ContextAttributes = ContextAttributes;
   exports.convertNativeToDart_ContextAttributes = convertNativeToDart_ContextAttributes;
   exports.convertNativeToDart_ImageData = convertNativeToDart_ImageData;
   exports.convertDartToNative_ImageData = convertDartToNative_ImageData;
@@ -950,8 +921,6 @@ dart_library.library('dart/html_common', null, /* Imports */[
   exports.isImmutableJavaScriptArray = isImmutableJavaScriptArray;
   exports.isJavaScriptPromise = isJavaScriptPromise;
   exports.convertNativePromiseToDartFuture = convertNativePromiseToDartFuture;
-  exports.wrap_jso = wrap_jso;
-  exports.unwrap_jso = unwrap_jso;
   exports.Device = Device;
   exports.FilteredElementList = FilteredElementList;
   exports.Lists = Lists;