Use symbols when looking up fields in a class

runtime/vm/parser_test.cc

 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 
 #include "vm/ast_printer.h"
 #include "vm/class_finalizer.h"
 #include "vm/debugger.h"
 #include "vm/longjump.h"
 #include "vm/object.h"
@@ skipping 47 matching lines @@
                 bool is_final) {
   const String& classname = String::Handle(Symbols::New(class_name));
   Class& cls = Class::Handle(lib.LookupClass(classname));
   EXPECT(!cls.IsNull());
 
   String& fieldname = String::Handle(String::New(field_name));
   String& functionname = String::Handle();
   Function& function = Function::Handle();
   Field& field = Field::Handle();
   if (expect_static) {
-    field ^= cls.LookupStaticField(fieldname);
+    field ^= cls.LookupStaticFieldAllowPrivate(fieldname);
     functionname ^= Field::GetterName(fieldname);
     function ^= cls.LookupStaticFunction(functionname);
     EXPECT(function.IsNull());
     functionname ^= Field::SetterName(fieldname);
     function ^= cls.LookupStaticFunction(functionname);
     EXPECT(function.IsNull());
   } else {
-    field ^= cls.LookupInstanceField(fieldname);
+    field ^= cls.LookupInstanceFieldAllowPrivate(fieldname);
     functionname ^= Field::GetterName(fieldname);
     function ^= cls.LookupDynamicFunction(functionname);
     EXPECT(!function.IsNull());
     functionname ^= Field::SetterName(fieldname);
     function ^= cls.LookupDynamicFunction(functionname);
     EXPECT(is_final ? function.IsNull() : !function.IsNull());
   }
   EXPECT(!field.IsNull());
 
   EXPECT_EQ(field.is_static(), expect_static);
@@ skipping 483 matching lines @@
       "   name=:current_context_var\n"
       " 1 ContextLevel  level=1   scope=2   begin=3   end=79\n"
       " 2 ContextVar    level=1   begin=9   end=79  name=x\n"
       " 3 StackVar      scope=2   begin=11  end=79  name=b\n",
       CaptureVarsAtLine(lib, "a", 10));
 }
 
 #endif  // !PRODUCT
 
 }  // namespace dart