Don't persist registrations for whitelists installed from the command line.

chrome/browser/component_updater/supervised_user_whitelist_installer.h

Index: chrome/browser/component_updater/supervised_user_whitelist_installer.h
diff --git a/chrome/browser/component_updater/supervised_user_whitelist_installer.h b/chrome/browser/component_updater/supervised_user_whitelist_installer.h
index 48157134a034b1341f68c32a0b282119228cf1f7..907e06a31e38de4b3ea265743465a93ab9b0f272 100644
--- a/chrome/browser/component_updater/supervised_user_whitelist_installer.h
+++ b/chrome/browser/component_updater/supervised_user_whitelist_installer.h
@@ -64,7 +64,8 @@ class SupervisedUserWhitelistInstaller {
 
   // Registers a new whitelist with the given |crx_id|.
   // The |client_id| should be a unique identifier for the client that is stable
-  // across restarts.
+  // across restarts. If it is empty, the registration will not be persisted in
+  // Local State.
   virtual void RegisterWhitelist(const std::string& client_id,
                                  const std::string& crx_id,
                                  const std::string& name) = 0;