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

tools/clang/blink_gc_plugin/tests/ref_ptr_to_gc_managed_class.cpp

Index: tools/clang/blink_gc_plugin/tests/ref_ptr_to_gc_managed_class.cpp
diff --git a/tools/clang/blink_gc_plugin/tests/ref_ptr_to_gc_managed_class.cpp b/tools/clang/blink_gc_plugin/tests/ref_ptr_to_gc_managed_class.cpp
deleted file mode 100644
index e0a200fed9540f685a11d0e83fbeb2bd48e344c6..0000000000000000000000000000000000000000
--- a/tools/clang/blink_gc_plugin/tests/ref_ptr_to_gc_managed_class.cpp
+++ /dev/null
@@ -1,11 +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 "ref_ptr_to_gc_managed_class.h"
-
-namespace blink {
-
-void HeapObject::trace(Visitor*) { }
-
-}