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

Source/platform/exported/WebHTTPLoadInfo.cpp

Index: Source/platform/exported/WebHTTPLoadInfo.cpp
diff --git a/Source/platform/exported/WebHTTPLoadInfo.cpp b/Source/platform/exported/WebHTTPLoadInfo.cpp
index db4da5a0d3daa73669a6f1977d2a79ca1dca064a..a03ef78b7097b80d5316f0c8fa66da64585c2c4a 100644
--- a/Source/platform/exported/WebHTTPLoadInfo.cpp
+++ b/Source/platform/exported/WebHTTPLoadInfo.cpp
@@ -105,7 +105,7 @@ static void addHeader(HTTPHeaderMap* map, const WebString& name, const WebString
     HTTPHeaderMap::AddResult result = map->add(name, value);
     // It is important that values are separated by '\n', not comma, otherwise Set-Cookie header is not parseable.
     if (!result.isNewEntry)
-        result.iterator->value = result.iterator->value + "\n" + String(value);
+        result.storedValue->value = result.storedValue->value + "\n" + String(value);
 }
 
 void WebHTTPLoadInfo::addRequestHeader(const WebString& name, const WebString& value)