[Remote suggestions] Clean up variation params in the fetcher.

components/ntp_snippets/remote/request_params.h

Index: components/ntp_snippets/remote/request_params.h
diff --git a/components/ntp_snippets/remote/request_params.h b/components/ntp_snippets/remote/request_params.h
index 02289dd3143163538a389b645d84f56f2b0fa210..f555756c36287406ad42aeaa6f2a26bcf3553c68 100644
--- a/components/ntp_snippets/remote/request_params.h
+++ b/components/ntp_snippets/remote/request_params.h
@@ -16,9 +16,6 @@
 
 namespace ntp_snippets {
 
-// Enumeration listing all possible variants of dealing with personalization.
-enum class Personalization { kPersonal, kNonPersonal, kBoth };
-
 // Contains all parameters for fetching remote suggestions.
 struct RequestParams {
   RequestParams();