Simpler return value from HashTable::add()/HashMap::add() and others

Source/platform/network/WebSocketHandshakeRequest.cpp

Index: Source/platform/network/WebSocketHandshakeRequest.cpp
diff --git a/Source/platform/network/WebSocketHandshakeRequest.cpp b/Source/platform/network/WebSocketHandshakeRequest.cpp
index 902be3becf8329ae87d8168d2a2d535cfca05ef5..c7576ae5d3982926ef8d49264c111473f158b0a8 100644
--- a/Source/platform/network/WebSocketHandshakeRequest.cpp
+++ b/Source/platform/network/WebSocketHandshakeRequest.cpp
@@ -52,7 +52,7 @@ void WebSocketHandshakeRequest::addAndMergeHeader(HTTPHeaderMap* map, const Atom
     HTTPHeaderMap::AddResult result = map->add(name, value);
     if (!result.isNewEntry) {
         // Inspector expects the "\n" separated format.
-        result.iterator->value = result.iterator->value + "\n" + String(value);
+        result.storedValue->value = result.storedValue->value + "\n" + String(value);
     }
 }