Allow direct and indirect navigation values to be varied via field trial.

chrome/browser/banners/app_banner_settings_helper.h

Index: chrome/browser/banners/app_banner_settings_helper.h
diff --git a/chrome/browser/banners/app_banner_settings_helper.h b/chrome/browser/banners/app_banner_settings_helper.h
index 74db0265a30ffdc49904cc2e0141952280a323ef..98624d8cc6bffaaf1c5673301d6ce5dfd819c04e 100644
--- a/chrome/browser/banners/app_banner_settings_helper.h
+++ b/chrome/browser/banners/app_banner_settings_helper.h
@@ -132,9 +132,8 @@ class AppBannerSettingsHelper {
   static base::Time BucketTimeToResolution(base::Time time,
                                            unsigned int minutes);
 
-  // Queries a field trial for updates to the default number of minutes between
-  // site visits counted for the purposes of displaying a banner.
-  static void UpdateMinutesBetweenVisits();
+  // Updates all values from field trial.
+  static void UpdateFromFieldTrial();
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(AppBannerSettingsHelper);