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

third_party/WebKit/Source/web/ContextFeaturesClientImpl.cpp

Index: third_party/WebKit/Source/web/ContextFeaturesClientImpl.cpp
diff --git a/third_party/WebKit/Source/web/ContextFeaturesClientImpl.cpp b/third_party/WebKit/Source/web/ContextFeaturesClientImpl.cpp
index 2e36ae4f009b7914a564a66e46dcb5088fa2523c..c372838aac87c05ec645de62658cb44f5437a0f4 100644
--- a/third_party/WebKit/Source/web/ContextFeaturesClientImpl.cpp
+++ b/third_party/WebKit/Source/web/ContextFeaturesClientImpl.cpp
@@ -84,6 +84,9 @@ class ContextFeaturesCache final
   DEFINE_INLINE_VIRTUAL_TRACE() { Supplement<Document>::trace(visitor); }
 
  private:
+  explicit ContextFeaturesCache(Document& document)
+      : Supplement<Document>(document) {}
+
   String m_domain;
   Entry m_entries[ContextFeatures::FeatureTypeSize];
 };
@@ -96,7 +99,7 @@ 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);
   }