[Icons NTP] Use GetVariationParamValue instead of experiment prefix to determine when large icons a…

chrome/browser/favicon/favicon_tab_helper.cc

Index: chrome/browser/favicon/favicon_tab_helper.cc
diff --git a/chrome/browser/favicon/favicon_tab_helper.cc b/chrome/browser/favicon/favicon_tab_helper.cc
index 80940039538ea403011162e71effdb0e8acd1c79..bc96548b1b81e22aa9d634270fd75bda75b9de2d 100644
--- a/chrome/browser/favicon/favicon_tab_helper.cc
+++ b/chrome/browser/favicon/favicon_tab_helper.cc
@@ -21,6 +21,7 @@
 #include "components/favicon/core/favicon_tab_helper_observer.h"
 #include "components/favicon_base/favicon_types.h"
 #include "components/history/core/browser/history_service.h"
+#include "components/variations/variations_associated_data.h"
 #include "content/public/browser/favicon_status.h"
 #include "content/public/browser/invalidate_type.h"
 #include "content/public/browser/navigation_controller.h"
@@ -47,8 +48,7 @@ namespace {
 
 // Returns whether icon NTP is enabled.
 bool IsIconNTPEnabled() {
-  return StartsWithASCII(base::FieldTrialList::FindFullName("IconNTP"),
-                         "Enabled", true);
+  return variations::GetVariationParamValue("IconNTP", "state") == "enabled";
 }
 
 }  // namespace