Revert "Pull chromium at 2c3ffb2355a27c32f45e508ef861416b820c823b"

tools/clang/blink_gc_plugin/tests/traceimpl_error.cpp

-// Copyright 2015 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 "traceimpl_error.h"
-
-namespace blink {
-
-void TraceImplExternWithUntracedMember::trace(Visitor* visitor) {
-  traceImpl(visitor);
-}
-
-template <typename VisitorDispatcher>
-inline void TraceImplExternWithUntracedMember::traceImpl(
-    VisitorDispatcher visitor) {
-  // Should get a warning as well.
-}
-
-void TraceImplExternWithUntracedBase::trace(Visitor* visitor) {
-  traceImpl(visitor);
-}
-
-template <typename VisitorDispatcher>
-inline void TraceImplExternWithUntracedBase::traceImpl(
-    VisitorDispatcher visitor) {
-  // Ditto.
-}
-
-}