Revert of Use the same browser instance in the sync confirmation dialog.

chrome/browser/ui/webui/signin/sync_confirmation_handler.h

Index: chrome/browser/ui/webui/signin/sync_confirmation_handler.h
diff --git a/chrome/browser/ui/webui/signin/sync_confirmation_handler.h b/chrome/browser/ui/webui/signin/sync_confirmation_handler.h
index 8953681eb80fb6a5796b90111bc26bb483e66101..5792dbc37999fcee1b3d17acb948e9ecf695321e 100644
--- a/chrome/browser/ui/webui/signin/sync_confirmation_handler.h
+++ b/chrome/browser/ui/webui/signin/sync_confirmation_handler.h
@@ -8,7 +8,6 @@
 #include <string>
 
 #include "base/macros.h"
-#include "chrome/browser/ui/browser_list_observer.h"
 #include "chrome/browser/ui/webui/signin/login_ui_service.h"
 #include "components/signin/core/browser/account_tracker_service.h"
 #include "content/public/browser/web_ui_message_handler.h"
@@ -18,10 +17,9 @@
 }
 
 class SyncConfirmationHandler : public content::WebUIMessageHandler,
-                                public AccountTrackerService::Observer,
-                                public chrome::BrowserListObserver {
+                                public AccountTrackerService::Observer {
  public:
-  explicit SyncConfirmationHandler(Browser* browser);
+  SyncConfirmationHandler();
   ~SyncConfirmationHandler() override;
 
   // content::WebUIMessageHandler:
@@ -29,9 +27,6 @@
 
   // AccountTrackerService::Observer:
   void OnAccountUpdated(const AccountInfo& info) override;
-
-  // chrome::BrowserListObserver:
-  void OnBrowserRemoved(Browser* browser) override;
 
  protected:
   // Handles "confirm" message from the page. No arguments.
@@ -65,11 +60,6 @@
       LoginUIService::SyncConfirmationUIClosedResult result);
 
  private:
-  Profile* profile_;
-
-  // Weak reference to the browser that showed the sync confirmation dialog.
-  Browser* browser_;
-
   // Records whether the user clicked on Undo, Ok, or Settings.
   bool did_user_explicitly_interact;