[cros] Use same textfield settings across existing/new user pods and screen lock.

chrome/browser/chromeos/login/textfield_with_margin.h

 // Copyright (c) 2010 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_CHROMEOS_LOGIN_TEXTFIELD_WITH_MARGIN_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_TEXTFIELD_WITH_MARGIN_H_
 #pragma once
 
 #include "views/controls/textfield/textfield.h"
 
 namespace chromeos {
 
 // Class that represents textfield with margin that is proportional to the text
 // height.
 class TextfieldWithMargin : public views::Textfield {
  public:
   TextfieldWithMargin();
+  explicit TextfieldWithMargin(views::Textfield::StyleFlags style);
 
-  explicit TextfieldWithMargin(views::Textfield::StyleFlags style)
-      : Textfield(style) {}
-
-  // Reimplements views::Textfield.
+ protected:
+  // Overridden from views::View:
   virtual void Layout();
 
  private:
   DISALLOW_COPY_AND_ASSIGN(TextfieldWithMargin);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_TEXTFIELD_WITH_MARGIN_H_