- Refactor Symbol allocation to expect a thread parameter.

runtime/vm/guard_field_test.cc

Index: runtime/vm/guard_field_test.cc
diff --git a/runtime/vm/guard_field_test.cc b/runtime/vm/guard_field_test.cc
index fcefc692b6a44704ca00d2f8661e83af57790baa..0e0972b98015d74c7da36bc2d627807d0a40eee6 100644
--- a/runtime/vm/guard_field_test.cc
+++ b/runtime/vm/guard_field_test.cc
@@ -13,7 +13,8 @@ RawField* LookupField(Dart_Handle library, const char* class_name,
                       const char* field_name) {
   RawLibrary* raw_library = Library::RawCast(Api::UnwrapHandle(library));
   Library& lib = Library::ZoneHandle(raw_library);
-  const String& classname = String::Handle(Symbols::New(class_name));
+  const String& classname = String::Handle(Symbols::New(Thread::Current(),
+                                                        class_name));
   Class& cls = Class::Handle(lib.LookupClass(classname));
   EXPECT(!cls.IsNull());  // No ambiguity error expected.