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

tools/clang/blink_gc_plugin/tests/garbage_collected_mixin.h

Index: tools/clang/blink_gc_plugin/tests/garbage_collected_mixin.h
diff --git a/tools/clang/blink_gc_plugin/tests/garbage_collected_mixin.h b/tools/clang/blink_gc_plugin/tests/garbage_collected_mixin.h
deleted file mode 100644
index 3c6f86869752c181f54893957ff7a2f59e1f8a71..0000000000000000000000000000000000000000
--- a/tools/clang/blink_gc_plugin/tests/garbage_collected_mixin.h
+++ /dev/null
@@ -1,29 +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.
-
-#ifndef GARBAGE_COLLECTED_MIXIN_H_
-#define GARBAGE_COLLECTED_MIXIN_H_
-
-#include "heap/stubs.h"
-
-namespace blink {
-
-class Mixin : public GarbageCollectedMixin {
-public:
-    virtual void trace(Visitor*) override;
-private:
-    Member<Mixin> m_self;
-};
-
-class HeapObject : public GarbageCollected<HeapObject>, public Mixin {
-    USING_GARBAGE_COLLECTED_MIXIN(HeapObject);
-public:
-    virtual void trace(Visitor*) override;
-private:
-    Member<Mixin> m_mix;
-};
-
-}
-
-#endif