Pass Setup Chrome Sync to main profile from Incognito.

chrome/browser/sync/profile_sync_service.cc

Index: chrome/browser/sync/profile_sync_service.cc
diff --git a/chrome/browser/sync/profile_sync_service.cc b/chrome/browser/sync/profile_sync_service.cc
index e9625e600b6181c229db3e230f15b0aaf6de9330..5349f7eb9c5b6eabd35f177c859cc1c5ea4b99da 100644
--- a/chrome/browser/sync/profile_sync_service.cc
+++ b/chrome/browser/sync/profile_sync_service.cc
@@ -38,6 +38,7 @@
 #include "chrome/browser/sync/signin_manager.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_list.h"
+#include "chrome/browser/ui/browser_window.h"
 #include "chrome/common/chrome_notification_types.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/chrome_version_info.h"
@@ -858,8 +859,14 @@ void ProfileSyncService::ShowConfigure(bool sync_everything) {
 
 void ProfileSyncService::ShowSyncSetup(SyncSetupWizard::State state) {
   wizard_.Step(state);
-  BrowserList::GetLastActiveWithProfile(profile())->ShowOptionsTab(
-      chrome::kSyncSetupSubPage);
+  Browser* browser = BrowserList::GetLastActiveWithProfile(profile());
+  if (!browser) {
+    browser = Browser::Create(profile());
+    browser->ShowOptionsTab(chrome::kSyncSetupSubPage);
+    browser->window()->Show();
+  } else {
+    browser->ShowOptionsTab(chrome::kSyncSetupSubPage);
+  }
 }
 
 SyncBackendHost::StatusSummary ProfileSyncService::QuerySyncStatusSummary() {