Annotate ScriptWrappable-embedding singletons.

third_party/WebKit/Source/core/dom/custom/CustomElementReactionStack.cpp

 // Copyright 2016 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 "core/dom/custom/CustomElementReactionStack.h"
 
 #include "bindings/core/v8/Microtask.h"
 #include "core/dom/Element.h"
 #include "core/dom/custom/CEReactionsScope.h"
 #include "core/dom/custom/CustomElementReactionQueue.h"
 #include "core/frame/FrameHost.h"
 
 namespace blink {
 
 namespace {
 
 Persistent<CustomElementReactionStack>& customElementReactionStack() {
+  ALLOW_UNSAFE_SINGLETON()
   DEFINE_STATIC_LOCAL(Persistent<CustomElementReactionStack>,
                       customElementReactionStack,
                       (new CustomElementReactionStack));
   return customElementReactionStack;
 }
 
 }  // namespace
 
 // TODO(dominicc): Consider using linked heap structures, avoiding
 // finalizers, to make short-lived entries fast.
@@ skipping 93 matching lines @@
 CustomElementReactionStack*
 CustomElementReactionStackTestSupport::setCurrentForTest(
     CustomElementReactionStack* newStack) {
   Persistent<CustomElementReactionStack>& stack = customElementReactionStack();
   CustomElementReactionStack* oldStack = stack.get();
   stack = newStack;
   return oldStack;
 }
 
 }  // namespace blink