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

tools/clang/blink_gc_plugin/tests/cycle_super_neg.cpp

Index: tools/clang/blink_gc_plugin/tests/cycle_super_neg.cpp
diff --git a/tools/clang/blink_gc_plugin/tests/cycle_super_neg.cpp b/tools/clang/blink_gc_plugin/tests/cycle_super_neg.cpp
deleted file mode 100644
index 33dec590677a33e3881c2c2ab34b1a6b59303862..0000000000000000000000000000000000000000
--- a/tools/clang/blink_gc_plugin/tests/cycle_super_neg.cpp
+++ /dev/null
@@ -1,18 +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 "cycle_super_neg.h"
-
-namespace blink {
-
-void B::trace(Visitor* visitor) {
-    A::trace(visitor);
-}
-
-void D::trace(Visitor* visitor) {
-    visitor->trace(m_c);
-    A::trace(visitor);
-}
-
-}