Switch dart:html objects not to be NativeFieldWrapper subclasses with JsInterop

tools/dom/templates/html/dartium/web_sql_dartium.darttemplate

 
 // DO NOT EDIT - unless you are editing documentation as per:
 // https://code.google.com/p/dart/wiki/ContributingHTMLDocumentation
 // Auto-generated dart:audio library.
 
 /**
  * An API for storing data in the browser that can be queried with SQL.
  *
  * **Caution:** this specification is no longer actively maintained by the Web
  * Applications Working Group and may be removed at any time.
  * See [the W3C Web SQL Database specification](http://www.w3.org/TR/webdatabase/)
  * for more information.
  *
  * The [dart:indexed_db] APIs is a recommended alternatives.
  */
 library dart.dom.web_sql;
 
 import 'dart:async';
 import 'dart:collection';
 import 'dart:_internal';
 import 'dart:html';
 import 'dart:html_common';
 import 'dart:nativewrappers';
 import 'dart:_blink' as _blink;
 import 'dart:js' as js;
 
-// Need a default constructor for constructing classes with mixins that are
-// also extending NativeFieldWrapperClass2.  Defining JsoNativeFieldWrapper
-// extending NativeFieldWrapperClass2 creates a default constructor.
-class JsoNativeFieldWrapper extends NativeFieldWrapperClass2 {}
-
 $!GENERATED_DART_FILES
 // FIXME: Can we make this private?
 final web_sqlBlinkMap = {
 $!TYPE_MAP
 };
 
 $if JSINTEROP
 // FIXME: Can we make this private?
 final web_sqlBlinkFunctionMap = {
 $!TYPE_FUNCTION_MAP
 };
 $endif