TabContents -> WebContentsImpl, part 18.

chrome/browser/history/history.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_HISTORY_HISTORY_H_
 #define CHROME_BROWSER_HISTORY_HISTORY_H_
 #pragma once
 
 #include <set>
 #include <vector>
@@ skipping 143 matching lines @@
   }
 
   // Navigation ----------------------------------------------------------------
 
   // Adds the given canonical URL to history with the current time as the visit
   // time. Referrer may be the empty string.
   //
   // The supplied render process host is used to scope the given page ID. Page
   // IDs are only unique inside a given render process, so we need that to
   // differentiate them. This pointer should not be dereferenced by the history
-  // system. Since render view host pointers may be reused (if one gets deleted
-  // and a new one created at the same address), TabContents should notify
-  // us when they are being destroyed through NotifyTabContentsDestruction.
+  // system.
   //
   // The scope/ids can be NULL if there is no meaningful tracking information
   // that can be performed on the given URL. The 'page_id' should be the ID of
   // the current session history entry in the given process.
   //
   // 'redirects' is an array of redirect URLs leading to this page, with the
   // page itself as the last item (so when there is no redirect, it will have
   // one entry). If there are no redirects, this array may also be empty for
   // the convenience of callers.
   //
@@ skipping 720 matching lines @@
   // True if needs top site migration.
   bool needs_top_sites_migration_;
 
   // The index used for quick history lookups.
   scoped_ptr<history::InMemoryURLIndex> in_memory_url_index_;
 
   DISALLOW_COPY_AND_ASSIGN(HistoryService);
 };
 
 #endif  // CHROME_BROWSER_HISTORY_HISTORY_H_