Move unique name generation and tracking into //content.

third_party/WebKit/Source/core/loader/FrameLoader.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights
  * reserved.
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved.
  * (http://www.torchmobile.com/)
  * Copyright (C) 2008 Alp Toker <alp@atoker.com>
  * Copyright (C) Research In Motion Limited 2009. All rights reserved.
  * Copyright (C) 2011 Kris Jordan <krisjordan@gmail.com>
  * Copyright (C) 2011 Google Inc. All rights reserved.
@@ skipping 395 matching lines @@
     FrameLoadType loadType,
     HistoryCommitType historyCommitType,
     HistoryNavigationType navigationType) {
   HistoryItem* oldItem = m_currentItem;
   if (isBackForwardLoadType(loadType) && m_provisionalItem)
     m_currentItem = m_provisionalItem.release();
   else
     m_currentItem = HistoryItem::create();
   m_currentItem->setURL(m_documentLoader->urlForHistory());
   m_currentItem->setDocumentState(m_frame->document()->formElementsState());
-  m_currentItem->setTarget(m_frame->tree().uniqueName());
   m_currentItem->setReferrer(SecurityPolicy::generateReferrer(
       m_documentLoader->getRequest().getReferrerPolicy(), m_currentItem->url(),
       m_documentLoader->getRequest().httpReferrer()));
   m_currentItem->setFormInfoFromRequest(m_documentLoader->getRequest());
 
   // Don't propagate state from the old item to the new item if there isn't an
   // old item (obviously), or if this is a back/forward navigation, since we
   // explicitly want to restore the state we just committed.
   if (!oldItem || isBackForwardLoadType(loadType))
     return;
@@ skipping 1476 matching lines @@
       frameLoadRequest.clientRedirect());
 
   loader->setLoadType(loadType);
   loader->setNavigationType(navigationType);
   loader->setReplacesCurrentHistoryItem(loadType ==
                                         FrameLoadTypeReplaceCurrentItem);
   return loader;
 }
 
 }  // namespace blink