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

Source/modules/webdatabase/QuotaTracker.cpp

Index: Source/modules/webdatabase/QuotaTracker.cpp
diff --git a/Source/modules/webdatabase/QuotaTracker.cpp b/Source/modules/webdatabase/QuotaTracker.cpp
index e6fa44b3b59692a9570c02dd82d8ab796b2dc3f4..2ee2b44153a01c7d8e029a88024e7b5cb93606c9 100644
--- a/Source/modules/webdatabase/QuotaTracker.cpp
+++ b/Source/modules/webdatabase/QuotaTracker.cpp
@@ -70,7 +70,7 @@ void QuotaTracker::updateDatabaseSize(
     unsigned long long databaseSize)
 {
     MutexLocker lockData(m_dataGuard);
-    HashMap<String, SizeMap>::iterator it = m_databaseSizes.add(originIdentifier, SizeMap()).iterator;
+    HashMap<String, SizeMap>::ValueType* it = m_databaseSizes.add(originIdentifier, SizeMap()).storedValue;
     it->value.set(databaseName, databaseSize);
 }