Simpler return value of HashTable::add/HashMap:add and others

Source/core/rendering/RenderRegion.cpp

 /*
  * Copyright (C) 2011 Adobe Systems Incorporated. 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.
@@ skipping 403 matching lines @@
 {
     ASSERT(isValid());
     return m_renderBoxRegionInfo.get(box);
 }
 
 RenderBoxRegionInfo* RenderRegion::setRenderBoxRegionInfo(const RenderBox* box, LayoutUnit logicalLeftInset, LayoutUnit logicalRightInset,
     bool containingBlockChainIsInset)
 {
     ASSERT(isValid());
 
-    OwnPtr<RenderBoxRegionInfo>& boxInfo = m_renderBoxRegionInfo.add(box, nullptr).iterator->value;
+    OwnPtr<RenderBoxRegionInfo>& boxInfo = m_renderBoxRegionInfo.add(box, nullptr).storedValue->value;
     if (boxInfo)
         *boxInfo = RenderBoxRegionInfo(logicalLeftInset, logicalRightInset, containingBlockChainIsInset);
     else
         boxInfo = adoptPtr(new RenderBoxRegionInfo(logicalLeftInset, logicalRightInset, containingBlockChainIsInset));
 
     return boxInfo.get();
 }
 
 PassOwnPtr<RenderBoxRegionInfo> RenderRegion::takeRenderBoxRegionInfo(const RenderBox* box)
 {
@@ skipping 242 matching lines @@
     return generatingNode();
 }
 
 bool RenderRegion::isElementBasedRegion() const
 {
     Node* node = nodeForRegion();
     return node && node->isElementNode() && !node->isPseudoElement();
 }
 
 } // namespace WebCore