Add a preference to clear plugin data on browser shutdown.

chrome/browser/ui/browser.cc

Index: chrome/browser/ui/browser.cc
diff --git a/chrome/browser/ui/browser.cc b/chrome/browser/ui/browser.cc
index 75e2e0444335e7be35e3d3c1aae2b2a65ff7a9d9..fa286efd5db0f9785a399b2ca414b5b8b5481b6b 100644
--- a/chrome/browser/ui/browser.cc
+++ b/chrome/browser/ui/browser.cc
@@ -1990,6 +1990,13 @@ void Browser::RegisterPrefs(PrefService* prefs) {
   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
@@ -1998,6 +2005,7 @@ void Browser::RegisterUserPrefs(PrefService* prefs) {
                             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
@@ -2018,6 +2026,7 @@ void Browser::RegisterUserPrefs(PrefService* prefs) {
   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);