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

tools/clang/blink_gc_plugin/tests/weak_fields_require_tracing.cpp

Index: tools/clang/blink_gc_plugin/tests/weak_fields_require_tracing.cpp
diff --git a/tools/clang/blink_gc_plugin/tests/weak_fields_require_tracing.cpp b/tools/clang/blink_gc_plugin/tests/weak_fields_require_tracing.cpp
deleted file mode 100644
index 382e9f9739283d27ab03e0f609e62b2b85ce2d62..0000000000000000000000000000000000000000
--- a/tools/clang/blink_gc_plugin/tests/weak_fields_require_tracing.cpp
+++ /dev/null
@@ -1,28 +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 "weak_fields_require_tracing.h"
-
-namespace blink {
-
-void HeapObject::trace(Visitor* visitor)
-{
-    // Missing visitor->trace(m_obj1);
-    // Missing visitor->trace(m_obj2);
-    // visitor->trace(m_obj3) in callback.
-    // Missing visitor->trace(m_set1);
-    visitor->trace(m_set2);
-    visitor->registerWeakMembers<HeapObject,
-                                 &HeapObject::clearWeakMembers>(this);
-}
-
-void HeapObject::clearWeakMembers(Visitor* visitor)
-{
-    visitor->trace(m_obj1);  // Does not count.
-    // Missing visitor->trace(m_obj2);
-    visitor->trace(m_obj3);  // OK.
-    visitor->trace(m_set1);  // Does not count.
-}
-
-}