Delete the NTPPreferAmpUrls feature flag.

components/ntp_snippets/features.h

Index: components/ntp_snippets/features.h
diff --git a/components/ntp_snippets/features.h b/components/ntp_snippets/features.h
index 8295e88f9ed732411065e7aa7af226d6e5a3d81f..b61bf25a198a34847d7db3ad466efe10929ac1a9 100644
--- a/components/ntp_snippets/features.h
+++ b/components/ntp_snippets/features.h
@@ -37,9 +37,6 @@ extern const base::Feature kForeignSessionsSuggestionsFeature;
 // Feature to allow UI as specified here: https://crbug.com/660837.
 extern const base::Feature kIncreasedVisibility;
 
-// Feature to prefer AMP URLs over regular URLs when available.
-extern const base::Feature kPreferAmpUrlsFeature;
-
 // Feature to listen for GCM push updates from the server.
 extern const base::Feature kContentSuggestionsPushFeature;