Ensure forced process swaps use the correct page_id and SiteInstance.

content/browser/tab_contents/tab_contents.h

 // Copyright (c) 2011 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 CONTENT_BROWSER_TAB_CONTENTS_TAB_CONTENTS_H_
 #define CONTENT_BROWSER_TAB_CONTENTS_TAB_CONTENTS_H_
 #pragma once
 
 #include <deque>
 #include <map>
@@ skipping 573 matching lines @@
   // entry already be set).
   //
   // This is used as the backend for state updates, which include a new title,
   // or the dedicated set title message. It returns true if the new title is
   // different and was therefore updated.
   bool UpdateTitleForEntry(NavigationEntry* entry, const string16& title);
 
   // Causes the TabContents to navigate in the right renderer to |entry|, which
   // must be already part of the entries in the navigation controller.
   // This does not change the NavigationController state.
-  bool NavigateToEntry(const NavigationEntry& entry,
+  bool NavigateToEntry(NavigationEntry& entry,
                        NavigationController::ReloadType reload_type);
 
   // Sets the history for this tab_contents to |history_length| entries, and
   // moves the current page_id to the last entry in the list if it's valid.
   // This is mainly used when a prerendered page is swapped into the current
   // tab. The method is virtual for testing.
   virtual void SetHistoryLengthAndPrune(const SiteInstance* site_instance,
                                         int merge_history_length,
                                         int32 minimum_page_id);
 
@@ skipping 244 matching lines @@
   ObserverList<TabContentsObserver> observers_;
 
   // Content restrictions, used to disable print/copy etc based on content's
   // (full-page plugins for now only) permissions.
   int content_restrictions_;
 
   DISALLOW_COPY_AND_ASSIGN(TabContents);
 };
 
 #endif  // CONTENT_BROWSER_TAB_CONTENTS_TAB_CONTENTS_H_