Revert of Sync: Support multiple setup UIs.

chrome/browser/ui/webui/options/sync_setup_handler.h

Index: chrome/browser/ui/webui/options/sync_setup_handler.h
diff --git a/chrome/browser/ui/webui/options/sync_setup_handler.h b/chrome/browser/ui/webui/options/sync_setup_handler.h
index ce72f04e6a1e42a7589b8e84fc7b54aaf3fc879a..2ca7278e8373db9a14a9e452c92566c0fb4957b9 100644
--- a/chrome/browser/ui/webui/options/sync_setup_handler.h
+++ b/chrome/browser/ui/webui/options/sync_setup_handler.h
@@ -25,10 +25,6 @@
 
 namespace signin_metrics {
 enum class AccessPoint;
-}
-
-namespace sync_driver {
-class SyncSetupInProgressHandle;
 }
 
 class SyncSetupHandler : public options::OptionsPageUIHandler,
@@ -157,9 +153,6 @@
   // Helper object used to wait for the sync backend to startup.
   std::unique_ptr<SyncStartupTracker> sync_startup_tracker_;
 
-  // Prevents Sync from running until configuration is complete.
-  std::unique_ptr<sync_driver::SyncSetupInProgressHandle> sync_blocker_;
-
   // Set to true whenever the sync configure UI is visible. This is used to tell
   // what stage of the setup wizard the user was in and to update the UMA
   // histograms in the case that the user cancels out.