Report hint on unmatched show and hide combinators.

sdk/lib/web_sql/dartium/web_sql_dartium.dart

 /**
  * 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  * **Caution:** this specification is no longer actively maintained by the Web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' hide deprecated;
+import 'dart:_internal';
 import 'dart:html';
 import 'dart:html_common';
 import 'dart:nativewrappers';
 import 'dart:_blink' as _blink;
 // DO NOT EDIT - unless you are editing documentation as per:
 // https://code.google.com/p/dart/wiki/ContributingHTMLDocumentation
 // Auto-generated dart:audio library.
 
 
 
@@ skipping 291 matching lines @@
 @deprecated // deprecated
 class SqlTransaction extends NativeFieldWrapperClass2 {
   // To suppress missing implicit constructor warnings.
   factory SqlTransaction._() { throw new UnsupportedError("Not supported"); }
 
   @DomName('SQLTransaction.executeSql')
   @DocsEditable()
   void executeSql(String sqlStatement, List<Object> arguments, [SqlStatementCallback callback, SqlStatementErrorCallback errorCallback]) => _blink.BlinkSQLTransaction.instance.executeSql_Callback_4_(unwrap_jso(this), sqlStatement, arguments, unwrap_jso(callback), unwrap_jso(errorCallback));
   
 }