Use initializer_lists for static WTF::HashSets.

third_party/WebKit/Source/core/fetch/RawResource.cpp

 /*
  * Copyright (C) 2011 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 187 matching lines @@
 
 void RawResource::setDefersLoading(bool defers)
 {
     if (m_loader)
         m_loader->setDefersLoading(defers);
 }
 
 static bool shouldIgnoreHeaderForCacheReuse(AtomicString headerName)
 {
     // FIXME: This list of headers that don't affect cache policy almost certainly isn't complete.
-    DEFINE_STATIC_LOCAL(HashSet<AtomicString>, m_headers, ());
-    if (m_headers.isEmpty()) {
-        m_headers.add("Cache-Control");
-        m_headers.add("If-Modified-Since");
-        m_headers.add("If-None-Match");
-        m_headers.add("Origin");
-        m_headers.add("Pragma");
-        m_headers.add("Purpose");
-        m_headers.add("Referer");
-        m_headers.add("User-Agent");
-        m_headers.add(HTTPNames::X_DevTools_Emulate_Network_Conditions_Client_Id);
-    }
-    return m_headers.contains(headerName);
+    DEFINE_STATIC_LOCAL(HashSet<AtomicString>, headers, ({
+        "Cache-Control",
+        "If-Modified-Since",
+        "If-None-Match",
+        "Origin",
+        "Pragma",
+        "Purpose",
+        "Referer",
+        "User-Agent",
+        HTTPNames::X_DevTools_Emulate_Network_Conditions_Client_Id,
+    }));
+    return headers.contains(headerName);
 }
 
 static bool isCacheableHTTPMethod(const AtomicString& method)
 {
     // Per http://www.w3.org/Protocols/rfc2616/rfc2616-sec13.html#sec13.10,
     // these methods always invalidate the cache entry.
     return method != "POST" && method != "PUT" && method != "DELETE";
 }
 
 bool RawResource::canReuse(const ResourceRequest& newRequest) const
@@ skipping 28 matching lines @@
     for (const auto& header : oldHeaders) {
         AtomicString headerName = header.key;
         if (!shouldIgnoreHeaderForCacheReuse(headerName) && header.value != newHeaders.get(headerName))
             return false;
     }
 
     return true;
 }
 
 } // namespace blink