Move elide_url to its own component

ui/secure_display/elide_url.h

 // Copyright 2014 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.
 //
 // This file defines utility functions for eliding URLs.
 
-#ifndef CHROME_BROWSER_UI_ELIDE_URL_H_
-#define CHROME_BROWSER_UI_ELIDE_URL_H_
+#ifndef UI_SECURE_DISPLAY_ELIDE_URL_H_
+#define UI_SECURE_DISPLAY_ELIDE_URL_H_
 
 #include <string>
 
 #include "base/strings/string16.h"
 
 class GURL;
 
 namespace gfx {
 class FontList;
 }
 
+namespace secure_display {
 // This function takes a GURL object and elides it. It returns a string
 // which composed of parts from subdomain, domain, path, filename and query.
 // A "..." is added automatically at the end if the elided string is bigger
 // than the |available_pixel_width|. For |available_pixel_width| == 0, a
 // formatted, but un-elided, string is returned. |languages| is a comma
 // separated list of ISO 639 language codes and is used to determine what
 // characters are understood by a user. It should come from
 // |prefs::kAcceptLanguages|.
 //
 // Note: in RTL locales, if the URL returned by this function is going to be
@@ skipping 24 matching lines @@
 // |languages| accepts the Unicode representation (see |net::FormatUrl| for more
 // details on the algorithm).
 //
 // - Omits the path for standard schemes, excepting file and filesystem.
 // - Omits the port if it is the default for the scheme.
 //
 // Do not use this for URLs which will be parsed or sent to other applications.
 base::string16 FormatUrlForSecurityDisplay(const GURL& origin,
                                            const std::string& languages);
 
-#endif  // CHROME_BROWSER_UI_ELIDE_URL_H_
+}  // namespace
+
+#endif  // UI_SECURE_DISPLAY_ELIDE_URL_H_