Fix sizing issues in the tab modal signin flow.

chrome/browser/ui/signin_view_controller.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_UI_SIGNIN_VIEW_CONTROLLER_H_
 #define CHROME_BROWSER_UI_SIGNIN_VIEW_CONTROLLER_H_
 
 #include "base/macros.h"
 #include "chrome/browser/ui/profile_chooser_constants.h"
 
@@ skipping 25 matching lines @@
   void ShowModalSyncConfirmationDialog(Browser* browser);
 
   // Closes the tab-modal signin flow previously shown using this
   // SigninViewController, if one exists. Does nothing otherwise.
   void CloseModalSignin();
 
   // Notifies this object that it's |signin_view_controller_delegate_|
   // member has become invalid.
   void ResetModalSigninDelegate();
 
+  SigninViewControllerDelegate* delegate() {
+    return signin_view_controller_delegate_;
+  }
+
  private:
   SigninViewControllerDelegate* signin_view_controller_delegate_;
 
   DISALLOW_COPY_AND_ASSIGN(SigninViewController);
 };
 
 #endif  // CHROME_BROWSER_UI_SIGNIN_VIEW_CONTROLLER_H_