Don't re-save autofill profiles to the web database if they haven't changed.

chrome/browser/webdata/web_database.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_WEBDATA_WEB_DATABASE_H_
 #define CHROME_BROWSER_WEBDATA_WEB_DATABASE_H_
 #pragma once
 
 #include <vector>
 
@@ skipping 304 matching lines @@
   FRIEND_TEST_ALL_PREFIXES(WebDatabaseTest,
                            Autofill_GetAllAutofillEntries_OneResult);
   FRIEND_TEST_ALL_PREFIXES(WebDatabaseTest,
                            Autofill_GetAllAutofillEntries_TwoDistinct);
   FRIEND_TEST_ALL_PREFIXES(WebDatabaseTest,
                            Autofill_GetAllAutofillEntries_TwoSame);
   FRIEND_TEST_ALL_PREFIXES(WebDatabaseTest, Autofill_UpdateDontReplace);
   FRIEND_TEST_ALL_PREFIXES(WebDatabaseTest, Autofill_AddFormFieldValues);
   FRIEND_TEST_ALL_PREFIXES(WebDatabaseTest, AutoFillProfile);
   FRIEND_TEST_ALL_PREFIXES(WebDatabaseTest, CreditCard);
+  FRIEND_TEST_ALL_PREFIXES(WebDatabaseTest, UpdateAutoFillProfile);
+  FRIEND_TEST_ALL_PREFIXES(WebDatabaseTest, UpdateCreditCard);
   FRIEND_TEST_ALL_PREFIXES(WebDatabaseTest,
                            RemoveAutoFillProfilesAndCreditCardsModifiedBetween);
 
   // Methods for adding autofill entries at a specified time.  For
   // testing only.
   bool AddFormFieldValuesTime(
       const std::vector<webkit_glue::FormField>& elements,
       std::vector<AutofillChange>* changes,
       base::Time time);
   bool AddFormFieldValueTime(const webkit_glue::FormField& element,
@@ skipping 25 matching lines @@
 
   sql::Connection db_;
   sql::MetaTable meta_table_;
 
   scoped_ptr<NotificationService> notification_service_;
 
   DISALLOW_COPY_AND_ASSIGN(WebDatabase);
 };
 
 #endif  // CHROME_BROWSER_WEBDATA_WEB_DATABASE_H_