Move frog tests using 'native' from tests/language to frog/tests

frog/minfrog

Index: frog/minfrog
diff --git a/frog/minfrog b/frog/minfrog
index 1fcc3400933ced5b6f4b8cd5b0ae883c9fa17196..5b505631410858270eac9ecf8a67cfde11212cfc 100755
--- a/frog/minfrog
+++ b/frog/minfrog
@@ -13099,7 +13099,7 @@ function FrogOptions(homedir, args, files) {
 function LibraryReader() {
   // Initializers done
   if ($eq($globals.options.config, 'dev')) {
-    this._specialLibs = _map(['dart:core', joinPaths($globals.options.libDir, 'corelib.dart'), 'dart:coreimpl', joinPaths($globals.options.libDir, 'corelib_impl.dart'), 'dart:html', joinPaths($globals.options.libDir, '../../client/html/release/html.dart'), 'dart:htmlimpl', joinPaths($globals.options.libDir, '../../client/html/release/htmlimpl.dart'), 'dart:dom', joinPaths($globals.options.libDir, '../../client/dom/frog/dom_frog.dart'), 'dart:json', joinPaths($globals.options.libDir, 'json.dart')]);
+    this._specialLibs = _map(['dart:core', joinPaths($globals.options.libDir, 'corelib.dart'), 'dart:coreimpl', joinPaths($globals.options.libDir, 'corelib_impl.dart'), 'dart:html', joinPaths($globals.options.libDir, '../../client/html/release/html.dart'), 'dart:htmlimpl', joinPaths($globals.options.libDir, '../../client/html/release/htmlimpl.dart'), 'dart:dom', joinPaths($globals.options.libDir, '../../client/dom/frog/dom_frog.dart'), 'dart:json', joinPaths($globals.options.libDir, 'json_frog.dart')]);
   }
   else if ($eq($globals.options.config, 'sdk')) {
     this._specialLibs = _map(['dart:core', joinPaths($globals.options.libDir, 'core/core_frog.dart'), 'dart:coreimpl', joinPaths($globals.options.libDir, 'coreimpl/coreimpl_frog.dart'), 'dart:html', joinPaths($globals.options.libDir, 'html/html.dart'), 'dart:htmlimpl', joinPaths($globals.options.libDir, 'htmlimpl/htmlimpl.dart'), 'dart:dom', joinPaths($globals.options.libDir, 'dom/frog/dom_frog.dart'), 'dart:json', joinPaths($globals.options.libDir, 'json/json_frog.dart')]);