Registering field trial for a feature overridden in chrome://flags.

chrome/browser/about_flags.h

Index: chrome/browser/about_flags.h
diff --git a/chrome/browser/about_flags.h b/chrome/browser/about_flags.h
index 91917421262c8a5540eed7331aeeca32dd94bc80..cbb42fcd157f5ed40f416262baf7472c7963c402 100644
--- a/chrome/browser/about_flags.h
+++ b/chrome/browser/about_flags.h
@@ -20,6 +20,7 @@
 
 namespace base {
 class ListValue;
+class FeatureList;
 }
 
 namespace flags_ui {
@@ -37,7 +38,8 @@ void ConvertFlagsToSwitches(flags_ui::FlagsStorage* flags_storage,
 // Registers variations parameter values stored in |flags_storage| (previously
 // selected in about:flags).
 void RegisterAllFeatureVariationParameters(
-    flags_ui::FlagsStorage* flags_storage);
+    flags_ui::FlagsStorage* flags_storage,
+    base::FeatureList* feature_list);
 
 // Compares a set of switches of the two provided command line objects and
 // returns true if they are the same and false otherwise.