Closing a guest session clears all browsing history.

chrome/browser/ui/browser_list.cc

 // 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.
 
 #include "chrome/browser/ui/browser_list.h"
 
 #include <algorithm>
 
 #include "base/auto_reset.h"
 #include "base/logging.h"
@@ skipping 197 matching lines @@
 bool BrowserList::IsOffTheRecordSessionActive() {
   for (chrome::BrowserIterator it; !it.done(); it.Next()) {
     if (it->profile()->IsOffTheRecord())
       return true;
   }
   return false;
 }
 
 // static
 bool BrowserList::IsOffTheRecordSessionActiveForProfile(Profile* profile) {
-  if (profile->IsGuestSession())
-    return true;
   for (chrome::BrowserIterator it; !it.done(); it.Next()) {
     if (it->profile()->IsSameProfile(profile) &&
         it->profile()->IsOffTheRecord()) {
       return true;
     }
   }
   return false;
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // BrowserList, private:
 
 BrowserList::BrowserList() {
 }
 
 BrowserList::~BrowserList() {
 }
 
 // static
 void BrowserList::RemoveBrowserFrom(Browser* browser,
                                     BrowserVector* browser_list) {
   BrowserVector::iterator remove_browser =
       std::find(browser_list->begin(), browser_list->end(), browser);
   if (remove_browser != browser_list->end())
     browser_list->erase(remove_browser);
 }