Implemented a policy to match the ClearSiteDataOnExit pref.

chrome/browser/ui/cocoa/options/content_settings_dialog_controller.mm

Index: chrome/browser/ui/cocoa/options/content_settings_dialog_controller.mm
diff --git a/chrome/browser/ui/cocoa/options/content_settings_dialog_controller.mm b/chrome/browser/ui/cocoa/options/content_settings_dialog_controller.mm
index 5186bcb6d95b038c2433b0d6fd233f5b2684f8be..7c8fe9e308c3d370b454fdad73177a18142a9684 100644
--- a/chrome/browser/ui/cocoa/options/content_settings_dialog_controller.mm
+++ b/chrome/browser/ui/cocoa/options/content_settings_dialog_controller.mm
@@ -306,6 +306,10 @@ class PrefObserverDisabler {
   return settingsMap->IsBlockThirdPartyCookiesManaged();
 }
 
+- (BOOL)clearSiteDataOnExitManaged {
+  return clearSiteDataOnExit_.IsManaged();
+}
+
 - (BOOL)clearSiteDataOnExit {
   return clearSiteDataOnExit_.GetValue();
 }
@@ -590,6 +594,8 @@ class PrefObserverDisabler {
   if (prefName == prefs::kClearSiteDataOnExit) {
     [self willChangeValueForKey:@"clearSiteDataOnExit"];
     [self didChangeValueForKey:@"clearSiteDataOnExit"];
+    [self willChangeValueForKey:@"clearSiteDataOnExitManaged"];
+    [self didChangeValueForKey:@"clearSiteDataOnExitManaged"];
   }
   if (prefName == prefs::kBlockThirdPartyCookies) {
     [self willChangeValueForKey:@"blockThirdPartyCookies"];