Use a new Supplement constructor for Supplement<Document> (Part 1)

third_party/WebKit/Source/web/ContextFeaturesClientImpl.cpp

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 66 matching lines @@
     size_t index = static_cast<size_t>(type);
     SECURITY_DCHECK(index < ContextFeatures::FeatureTypeSize);
     return m_entries[index];
   }
 
   void validateAgainst(Document*);
 
   DEFINE_INLINE_VIRTUAL_TRACE() { Supplement<Document>::trace(visitor); }
 
  private:
+  explicit ContextFeaturesCache(Document& document)
+      : Supplement<Document>(document) {}
+
   String m_domain;
   Entry m_entries[ContextFeatures::FeatureTypeSize];
 };
 
 const char* ContextFeaturesCache::supplementName() {
   return "ContextFeaturesCache";
 }
 
 ContextFeaturesCache& ContextFeaturesCache::from(Document& document) {
   ContextFeaturesCache* cache = static_cast<ContextFeaturesCache*>(
       Supplement<Document>::from(document, supplementName()));
   if (!cache) {
-    cache = new ContextFeaturesCache();
+    cache = new ContextFeaturesCache(document);
     Supplement<Document>::provideTo(document, supplementName(), cache);
   }
 
   return *cache;
 }
 
 void ContextFeaturesCache::validateAgainst(Document* document) {
   String currentDomain = document->getSecurityOrigin()->domain();
   if (currentDomain == m_domain)
     return;
@@ skipping 28 matching lines @@
 
   switch (type) {
     case ContextFeatures::MutationEvents:
       return frame->contentSettingsClient()->allowMutationEvents(defaultValue);
     default:
       return defaultValue;
   }
 }
 
 }  // namespace blink