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

tools/clang/blink_gc_plugin/tests/base_requires_tracing.cpp

Index: tools/clang/blink_gc_plugin/tests/base_requires_tracing.cpp
diff --git a/tools/clang/blink_gc_plugin/tests/base_requires_tracing.cpp b/tools/clang/blink_gc_plugin/tests/base_requires_tracing.cpp
deleted file mode 100644
index 87559a85c8c3e58959d882ac4f3364e7e30b96cb..0000000000000000000000000000000000000000
--- a/tools/clang/blink_gc_plugin/tests/base_requires_tracing.cpp
+++ /dev/null
@@ -1,21 +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_requires_tracing.h"
-
-namespace blink {
-
-void A::trace(Visitor* visitor) { }
-
-void C::trace(Visitor* visitor) {
-  visitor->trace(m_a);
-  // Missing B::trace(visitor)
-}
-
-void D::trace(Visitor* visitor) {
-  visitor->trace(m_a);
-  C::trace(visitor);
-}
-
-}