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

extensions/common/features/complex_feature.h

Index: extensions/common/features/complex_feature.h
diff --git a/extensions/common/features/complex_feature.h b/extensions/common/features/complex_feature.h
index bdd7fcc9c8cc7f36f2108d5c3d6c721889d9adca..25f4907d6f42a5046757a6c91d88a4fd5b0c1dcb 100644
--- a/extensions/common/features/complex_feature.h
+++ b/extensions/common/features/complex_feature.h
@@ -27,7 +27,7 @@ class ComplexFeature : public Feature {
   // extensions::Feature:
   virtual Availability IsAvailableToManifest(const std::string& extension_id,
                                              Manifest::Type type,
-                                             Location location,
+                                             Manifest::Location location,
                                              int manifest_version,
                                              Platform platform) const OVERRIDE;