Enable web-based sign in flow by default. Can use command line argument

chrome/browser/ui/webui/sync_promo/sync_promo_ui.cc

Index: chrome/browser/ui/webui/sync_promo/sync_promo_ui.cc
diff --git a/chrome/browser/ui/webui/sync_promo/sync_promo_ui.cc b/chrome/browser/ui/webui/sync_promo/sync_promo_ui.cc
index 214f9cca2d90f466ebfca62f48e74b778030fd7e..b6f9d2bea68aab319b0545fce1210c71acf98734 100644
--- a/chrome/browser/ui/webui/sync_promo/sync_promo_ui.cc
+++ b/chrome/browser/ui/webui/sync_promo/sync_promo_ui.cc
@@ -18,6 +18,7 @@
 #include "chrome/browser/profiles/profile_manager.h"
 #include "chrome/browser/sync/profile_sync_service.h"
 #include "chrome/browser/sync/profile_sync_service_factory.h"
+#include "chrome/browser/ui/sync/one_click_signin_helper.h"
 #include "chrome/browser/ui/webui/chrome_url_data_manager.h"
 #include "chrome/browser/ui/webui/chrome_web_ui_data_source.h"
 #include "chrome/browser/ui/webui/options/core_options_handler.h"
@@ -71,13 +72,6 @@ bool AllowPromoAtStartupForCurrentBrand() {
   return true;
 }
 
-bool UseWebBasedSigninFlow() {
-  const bool use_web_based_singin_flow =
-      CommandLine::ForCurrentProcess()->HasSwitch(
-          switches::kUseWebBasedSigninFlow);
-  return use_web_based_singin_flow;
-}
-
 // The Web UI data source for the sync promo page.
 class SyncPromoUIHTMLSource : public ChromeWebUIDataSource {
  public:
@@ -228,7 +222,7 @@ GURL SyncPromoUI::GetSyncPromoURL(const GURL& next_page,
 
   std::string url_string;
 
-  if (UseWebBasedSigninFlow()) {
+  if (OneClickSigninHelper::UseWebBasedSigninFlow()) {
     // Build a Gaia-based URL that can be used to sign the user into chrome.
     // There are required request parameters:
     //