[Autofill] Style cleanup in phone number-related code.

chrome/browser/autofill/phone_number.h

 // Copyright (c) 2011 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_AUTOFILL_PHONE_NUMBER_H_
 #define CHROME_BROWSER_AUTOFILL_PHONE_NUMBER_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 69 matching lines @@
   // with it, falls back to the country code corresponding to the |app_locale|.
   std::string GetRegion(const std::string& app_locale) const;
 
   // Updates the cached parsed number if the profile's region has changed
   // since the last time the cache was updated.
   void UpdateCacheIfNeeded(const std::string& app_locale) const;
 
   // The phone number.
   string16 number_;
   // Profile which stores the region used as hint when normalizing the number.
-  AutofillProfile* profile_;  // WEAK
+  const AutofillProfile* profile_;  // WEAK
 
   // Cached number.
   mutable autofill_i18n::PhoneObject cached_parsed_phone_;
 };
 
 #endif  // CHROME_BROWSER_AUTOFILL_PHONE_NUMBER_H_