Move flags_ui resources and constants to //components.

TBR=jochen
NOPRESUBMIT=true

Review URL: https://codereview.chromium.org/1354153002

Cr-Commit-Position: refs/heads/master@{#350502}
diff --git a/components/components_strings.grd b/components/components_strings.grd
index f5ce76c2..f71b63d 100644
--- a/components/components_strings.grd
+++ b/components/components_strings.grd
@@ -138,6 +138,7 @@
       <part file="data_reduction_proxy_strings.grdp" />
       <part file="dom_distiller_strings.grdp" />
       <part file="error_page_strings.grdp" />
+      <part file="flags_ui_strings.grdp" />
       <part file="omnibox_strings.grdp" />
       <part file="password_manager_strings.grdp" />
       <part file="pdf_strings.grdp" />