Support a "policy" extension location in extension features files. At the same

extensions/common/features/simple_feature_filter.h

Index: extensions/common/features/simple_feature_filter.h
diff --git a/extensions/common/features/simple_feature_filter.h b/extensions/common/features/simple_feature_filter.h
index 59e8f445c968071128b9438c091c9b105346ed95..c325250b6b1235938a6fe6972d78bd475bbfebcd 100644
--- a/extensions/common/features/simple_feature_filter.h
+++ b/extensions/common/features/simple_feature_filter.h
@@ -47,7 +47,7 @@ class SimpleFeatureFilter {
   virtual Feature::Availability IsAvailableToManifest(
       const std::string& extension_id,
       Manifest::Type type,
-      Feature::Location location,
+      Manifest::Location location,
       int manifest_version,
       Feature::Platform platform) const;