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

tools/clang/blink_gc_plugin/tests/class_requires_trace_method.cpp

Index: tools/clang/blink_gc_plugin/tests/class_requires_trace_method.cpp
diff --git a/tools/clang/blink_gc_plugin/tests/class_requires_trace_method.cpp b/tools/clang/blink_gc_plugin/tests/class_requires_trace_method.cpp
deleted file mode 100644
index f18fdf6d3265c0c7c1aa573740b2001c2513a71f..0000000000000000000000000000000000000000
--- a/tools/clang/blink_gc_plugin/tests/class_requires_trace_method.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 "class_requires_trace_method.h"
-
-namespace blink {
-
-void Mixin2::trace(Visitor* visitor)
-{
-  Mixin::trace(visitor);
-}
-
-void Mixin3::trace(Visitor* visitor)
-{
-  Mixin::trace(visitor);
-}
-
-} // namespace blink