Remove tools/clang (this will break things temporarily).

tools/clang/blink_gc_plugin/tests/base_class_must_define_virtual_trace.cpp

Index: tools/clang/blink_gc_plugin/tests/base_class_must_define_virtual_trace.cpp
diff --git a/tools/clang/blink_gc_plugin/tests/base_class_must_define_virtual_trace.cpp b/tools/clang/blink_gc_plugin/tests/base_class_must_define_virtual_trace.cpp
deleted file mode 100644
index cd38ec90fa96e20bc7ad52b3ca07f688e8a1a215..0000000000000000000000000000000000000000
--- a/tools/clang/blink_gc_plugin/tests/base_class_must_define_virtual_trace.cpp
+++ /dev/null
@@ -1,19 +0,0 @@
-// Copyright 2014 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 "base_class_must_define_virtual_trace.h"
-
-namespace blink {
-
-void PartDerived::trace(Visitor* visitor)
-{
-}
-
-void HeapDerived::trace(Visitor* visitor)
-{
-    visitor->trace(m_part);
-}
-
-
-}