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

lib/runtime/dart/html_common.js

 dart_library.library('dart/html_common', null, /* Imports */[
   'dart/_runtime',
   'dart/_metadata',
   'dart/core',
   'dart/html',
   'dart/typed_data',
   '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);
   const _validateToken = Symbol('_validateToken');
   class CssClassSetImpl extends core.Object {
     [_validateToken](value) {
       if (dart.notNull(CssClassSetImpl._validTokenRE.hasMatch(value))) return value;
       dart.throw(new core.ArgumentError.value(value, 'value', 'Not a valid class token'));
     }
     toString() {
@@ skipping 77 matching lines @@
       if (!(typeof value == 'string')) return false;
       let s = this.readClasses();
       let result = s.remove(value);
       this.writeClasses(s);
       return result;
     }
     addAll(iterable) {
       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$(core.String)]));
     }
     toggleAll(iterable, shouldAdd) {
       if (shouldAdd === void 0) shouldAdd = null;
       iterable[dartx.forEach](dart.fn(e => this.toggle(e, shouldAdd), core.bool, [core.String]));
     }
     retainAll(iterable) {
       this.modify(dart.fn(s => s.retainAll(iterable), dart.void, [core.Set$(core.String)]));
     }
     removeWhere(test) {
       this.modify(dart.fn(s => s.removeWhere(test), dart.void, [core.Set$(core.String)]));
@@ skipping 85 matching lines @@
       remove: [core.bool, [core.Object]],
       addAll: [dart.void, [core.Iterable$(core.String)]],
       removeAll: [dart.void, [core.Iterable$(core.Object)]],
       toggleAll: [dart.void, [core.Iterable$(core.String)], [core.bool]],
       retainAll: [dart.void, [core.Iterable$(core.Object)]],
       removeWhere: [dart.void, [dart.functionType(core.bool, [core.String])]],
       retainWhere: [dart.void, [dart.functionType(core.bool, [core.String])]],
       containsAll: [core.bool, [core.Iterable$(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$(core.String), [core.int]],
       takeWhile: [core.Iterable$(core.String), [dart.functionType(core.bool, [core.String])]],
       skip: [core.Iterable$(core.String), [core.int]],
       skipWhile: [core.Iterable$(core.String), [dart.functionType(core.bool, [core.String])]],
       firstWhere: [core.String, [dart.functionType(core.bool, [core.String])], {orElse: dart.functionType(core.String, [])}],
       lastWhere: [core.String, [dart.functionType(core.bool, [core.String])], {orElse: dart.functionType(core.String, [])}],
       singleWhere: [core.String, [dart.functionType(core.bool, [core.String])]],
       elementAt: [core.String, [core.int]],
@@ skipping 194 matching lines @@
   }
   dart.setSignature(_AcceptStructuredClone, {
     methods: () => ({
       findSlot: [core.int, [dart.dynamic]],
       readSlot: [dart.dynamic, [core.int]],
       writeSlot: [dart.dynamic, [core.int, dart.dynamic]],
       walk: [dart.dynamic, [dart.dynamic]],
       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;
       this.failIfMajorPerformanceCaveat = failIfMajorPerformanceCaveat;
       this.premultipliedAlpha = premultipliedAlpha;
       this.preserveDrawingBuffer = preserveDrawingBuffer;
       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;
       this.height = height;
       this.width = width;
     }
   }
   _TypedImageData[dart.implements] = () => [html.ImageData];
   dart.setSignature(_TypedImageData, {
     constructors: () => ({_TypedImageData: [_TypedImageData, [typed_data.Uint8ClampedList, core.int, core.int]]})
@@ skipping 147 matching lines @@
   }
   dart.fn(isJavaScriptPromise, core.bool, [dart.dynamic]);
   function convertNativePromiseToDartFuture(promise) {
     let completer = async.Completer.new();
     let then = dart.dcall(/* Unimplemented unknown name */convertDartClosureToJS, dart.fn(result => completer.complete(result), dart.void, [dart.dynamic]), 1);
     let error = dart.dcall(/* Unimplemented unknown name */convertDartClosureToJS, dart.fn(result => completer.completeError(result), dart.void, [dart.dynamic]), 1);
     let newPromise = promise.then(then).catch(error);
     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];
     }
     static get isOpera() {
       if (Device._isOpera == null) {
         Device._isOpera = Device.userAgent[dartx.contains]("Opera", 0);
       }
       return Device._isOpera;
     }
@@ skipping 66 matching lines @@
   const _childNodes = Symbol('_childNodes');
   const _node = Symbol('_node');
   const _iterable = Symbol('_iterable');
   const _filtered = Symbol('_filtered');
   class FilteredElementList extends collection.ListBase$(html.Element) {
     FilteredElementList(node) {
       this[_childNodes] = node[dartx.nodes];
       this[_node] = node;
     }
     get [_iterable]() {
-      return new (_internal.WhereIterable$(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});
     }
     forEach(f) {
       this[_filtered][dartx.forEach](f);
     }
     set(index, value) {
       this.get(index)[dartx.replaceWith](value);
       return value;
@@ skipping 181 matching lines @@
       lastIndexOf: [core.int, [core.List, core.Object, core.int]],
       getRange: [core.List, [core.List, core.int, core.int, core.List]]
     }),
     names: ['indexOf', 'lastIndexOf', 'getRange']
   });
   class NodeListWrapper extends core.Object {}
   // Exports:
   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;
   exports.annotation_Creates_SerializedScriptValue = annotation_Creates_SerializedScriptValue;
   exports.annotation_Returns_SerializedScriptValue = annotation_Returns_SerializedScriptValue;
   exports.convertNativeToDart_Dictionary = convertNativeToDart_Dictionary;
   exports.convertDartToNative_Dictionary = convertDartToNative_Dictionary;
   exports.convertDartToNative_StringArray = convertDartToNative_StringArray;
   exports.convertNativeToDart_DateTime = convertNativeToDart_DateTime;
   exports.convertDartToNative_DateTime = convertDartToNative_DateTime;
   exports.convertDartToNative_PrepareForStructuredClone = convertDartToNative_PrepareForStructuredClone;
   exports.convertNativeToDart_AcceptStructuredClone = convertNativeToDart_AcceptStructuredClone;
   exports.isJavaScriptDate = isJavaScriptDate;
   exports.isJavaScriptRegExp = isJavaScriptRegExp;
   exports.isJavaScriptArray = isJavaScriptArray;
   exports.isJavaScriptSimpleObject = isJavaScriptSimpleObject;
   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;
   exports.NodeListWrapper = NodeListWrapper;
 });