Refactor SecurityStateModel/Clients for simplicity and reusability.

components/components_strings.grd

Index: components/components_strings.grd
diff --git a/components/components_strings.grd b/components/components_strings.grd
index 95920283b2c6186715dfdbde1b8d7d2c20f3c548..ff3c6bbf64264d6a78d873bd1f17e6bbb83adabe 100644
--- a/components/components_strings.grd
+++ b/components/components_strings.grd
@@ -206,6 +206,7 @@
       <part file="physical_web_ui_strings.grdp" />
       <part file="policy_strings.grdp" />
       <part file="security_interstitials_strings.grdp" />
+      <part file="security_state_strings.grdp" />
       <part file="ssl_errors_strings.grdp" />
       <part file="supervised_user_error_page_strings.grdp" />
       <part file="sync_ui_strings.grdp" />