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

tools/clang/blink_gc_plugin/tests/garbage_collected_mixin.cpp

Index: tools/clang/blink_gc_plugin/tests/garbage_collected_mixin.cpp
diff --git a/tools/clang/blink_gc_plugin/tests/garbage_collected_mixin.cpp b/tools/clang/blink_gc_plugin/tests/garbage_collected_mixin.cpp
deleted file mode 100644
index e8f42f261d7a54156d0ad4a1a921f1190d9b0f34..0000000000000000000000000000000000000000
--- a/tools/clang/blink_gc_plugin/tests/garbage_collected_mixin.cpp
+++ /dev/null
@@ -1,20 +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 "garbage_collected_mixin.h"
-
-namespace blink {
-
-void Mixin::trace(Visitor* visitor)
-{
-    // Missing: visitor->trace(m_self);
-}
-
-void HeapObject::trace(Visitor* visitor)
-{
-    visitor->trace(m_mix);
-    // Missing: Mixin::trace(visitor);
-}
-
-}