Add a preference to clear plugin data on browser shutdown.

chrome/browser/ui/browser.cc

 // Copyright (c) 2010 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.h"
 
 #if defined(OS_WIN)
 #include <shellapi.h>
 #include <windows.h>
 #endif  // OS_WIN
@@ skipping 1992 matching lines @@
   prefs->RegisterBooleanPref(prefs::kClearPluginLSODataEnabled, false);
 #endif
 }
 
 // static
 void Browser::RegisterUserPrefs(PrefService* prefs) {
   prefs->RegisterStringPref(prefs::kHomePage,
                             chrome::kChromeUINewTabURL);
   prefs->RegisterBooleanPref(prefs::kHomePageIsNewTabPage, true);
   prefs->RegisterBooleanPref(prefs::kClearSiteDataOnExit, false);
+  prefs->RegisterBooleanPref(prefs::kClearPluginLSODataOnExit, false);
   prefs->RegisterBooleanPref(prefs::kShowHomeButton, false);
 #if defined(OS_MACOSX)
   // This really belongs in platform code, but there's no good place to
   // initialize it between the time when the AppController is created
   // (where there's no profile) and the time the controller gets another
   // crack at the start of the main event loop. By that time, BrowserInit
   // has already created the browser window, and it's too late: we need the
   // pref to be already initialized. Doing it here also saves us from having
   // to hard-code pref registration in the several unit tests that use
   // this preference.
@@ skipping 2171 matching lines @@
     // The page transition below is only for the purpose of inserting the tab.
     browser->AddTab(contents_dupe, PageTransition::LINK);
   }
 
   if (profile_->HasSessionService()) {
     SessionService* session_service = profile_->GetSessionService();
     if (session_service)
       session_service->TabRestored(&new_contents->controller(), pinned);
   }
 }