(Concept patch) Simplify WTF::HashTable::add() return value for size and performance

Source/modules/webdatabase/QuotaTracker.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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 52 matching lines @@
 
     // The embedder hasn't pushed this value to us, so we pull it as needed.
     *spaceAvailable = blink::Platform::current()->databaseGetSpaceAvailableForOrigin(originIdentifier);
 }
 
 void QuotaTracker::updateDatabaseSize(
     const String& originIdentifier, const String& databaseName,
     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()).iterator;
     it->value.set(databaseName, databaseSize);
 }
 
 void QuotaTracker::updateSpaceAvailableToOrigin(const String& originIdentifier, unsigned long long spaceAvailable)
 {
     MutexLocker lockData(m_dataGuard);
     m_spaceAvailableToOrigins.set(originIdentifier, spaceAvailable);
 }
 
 void QuotaTracker::resetSpaceAvailableToOrigin(const String& originIdentifier)
 {
     MutexLocker lockData(m_dataGuard);
     m_spaceAvailableToOrigins.remove(originIdentifier);
 }
 
 } // namespace WebCore