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 1972 matching lines @@
     prefs->SetBoolean(prefs::kHomePageIsNewTabPage, false);
 }
 
 // static
 void Browser::RegisterPrefs(PrefService* prefs) {
   prefs->RegisterDictionaryPref(prefs::kBrowserWindowPlacement);
   prefs->RegisterIntegerPref(prefs::kOptionsWindowLastTabIndex, 0);
   prefs->RegisterIntegerPref(prefs::kDevToolsSplitLocation, -1);
   prefs->RegisterDictionaryPref(prefs::kPreferencesWindowPlacement);
   prefs->RegisterIntegerPref(prefs::kExtensionSidebarWidth, -1);
+  // Educated guess: Chrome has a bundled Flash version supporting
+  // clearing LSO data, Chromium hasn't.
+#if defined(GOOGLE_CHROME_BUILD)
+  prefs->RegisterBooleanPref(prefs::kClearPluginLSODataEnabled, true);
+#else
+  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.
   prefs->RegisterBooleanPref(prefs::kShowPageOptionsButtons, false);
   prefs->RegisterBooleanPref(prefs::kShowUpdatePromotionInfoBar, true);
 #endif
   prefs->RegisterStringPref(prefs::kRecentlySelectedEncoding, "");
   prefs->RegisterBooleanPref(prefs::kDeleteBrowsingHistory, true);
   prefs->RegisterBooleanPref(prefs::kDeleteDownloadHistory, true);
   prefs->RegisterBooleanPref(prefs::kDeleteCache, true);
   prefs->RegisterBooleanPref(prefs::kDeleteCookies, true);
   prefs->RegisterBooleanPref(prefs::kDeletePasswords, false);
   prefs->RegisterBooleanPref(prefs::kDeleteFormData, false);
+  prefs->RegisterBooleanPref(prefs::kDeleteLSOData, false);
   prefs->RegisterIntegerPref(prefs::kDeleteTimePeriod, 0);
   prefs->RegisterBooleanPref(prefs::kCheckDefaultBrowser, true);
   prefs->RegisterBooleanPref(prefs::kShowOmniboxSearchHint, true);
   prefs->RegisterBooleanPref(prefs::kWebAppCreateOnDesktop, true);
   prefs->RegisterBooleanPref(prefs::kWebAppCreateInAppsMenu, true);
   prefs->RegisterBooleanPref(prefs::kWebAppCreateInQuickLaunchBar, true);
   prefs->RegisterBooleanPref(prefs::kUseVerticalTabs, false);
   prefs->RegisterBooleanPref(prefs::kEnableTranslate, true);
   prefs->RegisterBooleanPref(prefs::kRemotingHasSetupCompleted, false);
   prefs->RegisterStringPref(prefs::kCloudPrintEmail, std::string());
@@ skipping 2111 matching lines @@
   NOTREACHED();
   return false;
 }
 
 void Browser::CreateInstantIfNecessary() {
   if (type() == TYPE_NORMAL && InstantController::IsEnabled(profile()) &&
       !profile()->IsOffTheRecord()) {
     instant_.reset(new InstantController(profile_, this));
   }
 }