Add a preference to clear plugin data on browser shutdown.

chrome/common/pref_names.h

Index: chrome/common/pref_names.h
diff --git a/chrome/common/pref_names.h b/chrome/common/pref_names.h
index 46d50cee900bd7da0a6fa0951303dd8e8288d2f0..9f5cb8db90d46c195f9b73297cf6e149fd066f20 100644
--- a/chrome/common/pref_names.h
+++ b/chrome/common/pref_names.h
@@ -167,6 +167,8 @@ extern const char kDeleteCache[];
 extern const char kDeleteCookies[];
 extern const char kDeletePasswords[];
 extern const char kDeleteFormData[];
+extern const char kDeleteLSOData[];
+extern const char kClearPluginLSODataEnabled[];
 extern const char kEnableSpellCheck[];
 extern const char kEnabledLabsExperiments[];
 extern const char kEnableAutoSpellCorrect[];
@@ -210,6 +212,7 @@ extern const char kContentSettingsPatterns[];
 extern const char kBlockThirdPartyCookies[];
 extern const char kBlockNonsandboxedPlugins[];
 extern const char kClearSiteDataOnExit[];
+extern const char kClearPluginLSODataOnExit[];
 extern const char kDefaultZoomLevel[];
 extern const char kPerHostZoomLevels[];
 extern const char kAutoFillEnabled[];