Move policy strings to components/policy_strings.grdp.

This facilitates the refactoring of chrome/browser/policy into a layered
component.

BUG=271392
TBR=joi

Review URL: https://codereview.chromium.org/85753005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@237336 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/components/component_strings.grd b/components/component_strings.grd
index 28e2a46..4feabebd 100644
--- a/components/component_strings.grd
+++ b/components/component_strings.grd
@@ -169,6 +169,7 @@
     <messages fallback_to_english="true">
       <part file="autofill_strings.grdp" />
       <part file="dom_distiller_strings.grdp" />
+      <part file="policy_strings.grdp" />
     </messages>
   </release>
 </grit>