[NTP::SectionOrder] Replace CategoryFactory with a category ranker.

components/ntp_snippets/content_suggestions_provider.cc

Index: components/ntp_snippets/content_suggestions_provider.cc
diff --git a/components/ntp_snippets/content_suggestions_provider.cc b/components/ntp_snippets/content_suggestions_provider.cc
index 34896577b984691a8bce6b4a0adc58dade8d582f..23536c683b7880007f04464ad1353e330badf269 100644
--- a/components/ntp_snippets/content_suggestions_provider.cc
+++ b/components/ntp_snippets/content_suggestions_provider.cc
@@ -4,14 +4,10 @@
 
 #include "components/ntp_snippets/content_suggestions_provider.h"
 
-#include "components/ntp_snippets/category_factory.h"
-
 namespace ntp_snippets {
 
-ContentSuggestionsProvider::ContentSuggestionsProvider(
-    Observer* observer,
-    CategoryFactory* category_factory)
-    : observer_(observer), category_factory_(category_factory) {}
+ContentSuggestionsProvider::ContentSuggestionsProvider(Observer* observer)
+    : observer_(observer) {}
 
 ContentSuggestionsProvider::~ContentSuggestionsProvider() = default;