Ntp: use AMP urls for content suggestions when available.

components/ntp_snippets/remote/remote_suggestions_provider.cc

Index: components/ntp_snippets/remote/remote_suggestions_provider.cc
diff --git a/components/ntp_snippets/remote/remote_suggestions_provider.cc b/components/ntp_snippets/remote/remote_suggestions_provider.cc
index ea4551e9518b6f0b9ee066d93f785de4b2c3a5bd..f138e80d9880fbdbadc6b5cde1c7b818d52bb6f3 100644
--- a/components/ntp_snippets/remote/remote_suggestions_provider.cc
+++ b/components/ntp_snippets/remote/remote_suggestions_provider.cc
@@ -199,8 +199,12 @@ std::vector<ContentSuggestion> ConvertToContentSuggestions(
     if (!snippet->is_complete()) {
       continue;
     }
-    ContentSuggestion suggestion(category, snippet->id(), snippet->url());
-    suggestion.set_amp_url(snippet->amp_url());
+    GURL url = snippet->url();
+    if (base::FeatureList::IsEnabled(kPreferAmpUrlsFeature) &&
+        !snippet->amp_url().is_empty()) {
+      url = snippet->amp_url();
+    }
+    ContentSuggestion suggestion(category, snippet->id(), url);
     suggestion.set_title(base::UTF8ToUTF16(snippet->title()));
     suggestion.set_snippet_text(base::UTF8ToUTF16(snippet->snippet()));
     suggestion.set_publish_date(snippet->publish_date());