Revert of GC plugin: improve error reporting when tracing illegal fields.

tools/clang/blink_gc_plugin/tests/persistent_no_trace.cpp

Index: tools/clang/blink_gc_plugin/tests/persistent_no_trace.cpp
diff --git a/tools/clang/blink_gc_plugin/tests/persistent_no_trace.cpp b/tools/clang/blink_gc_plugin/tests/persistent_no_trace.cpp
deleted file mode 100644
index 637b46f0e05d40f681bb587ff9e82c6bf9aba946..0000000000000000000000000000000000000000
--- a/tools/clang/blink_gc_plugin/tests/persistent_no_trace.cpp
+++ /dev/null
@@ -1,14 +0,0 @@
-// Copyright 2016 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "persistent_no_trace.h"
-
-namespace blink {
-
-void HeapObject::trace(Visitor* visitor) {
-    visitor->trace(m_crossThreadPersistent);
-    visitor->trace(m_crossThreadWeakPersistent);
-}
-
-}