Reland 37913. Clear local state on exit.

chrome/common/pref_names.cc

Index: chrome/common/pref_names.cc
diff --git a/chrome/common/pref_names.cc b/chrome/common/pref_names.cc
index 39fdb86e3803b4375a985c6c9db8e776d9d41442..45ca3a1bb6fc1e2e55afb1c13876bcc7c007155d 100644
--- a/chrome/common/pref_names.cc
+++ b/chrome/common/pref_names.cc
@@ -309,6 +309,10 @@ const wchar_t kPerHostContentSettings[] = L"profile.per_host_content_settings";
 // regardless of other content settings.
 const wchar_t kBlockThirdPartyCookies[] = L"profile.block_third_party_cookies";
 
+// Boolean that is true when all locally stored site data (e.g. cookies, local
+// storage, etc..) should be deleted on exit.
+const wchar_t kClearSiteDataOnExit[] = L"profile.clear_site_data_on_exit";
+
 // Dictionary that maps hostnames to zoom levels.  Hosts not in this pref will
 // be displayed at the default zoom level.
 const wchar_t kPerHostZoomLevels[] = L"profile.per_host_zoom_levels";