Use chromium logic for database identifier<->origin conversions

webkit/base/webkit_base.gyp

 # Copyright 2013 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.
 
 {
   'targets': [
     {
       'target_name': 'webkit_base',
       'type': '<(component)',
       'variables': { 'enable_wexit_time_destructors': 1, },
       'dependencies': [
         '<(DEPTH)/base/base.gyp:base',
         '<(DEPTH)/net/net.gyp:net',
         '<(DEPTH)/third_party/WebKit/public/blink.gyp:blink',
         '<(DEPTH)/url/url.gyp:url_lib',
       ],
       'defines': ['WEBKIT_BASE_IMPLEMENTATION'],
       'sources': [
         'data_element.cc',
         'data_element.h',
         'file_path_string_conversions.cc',
         'file_path_string_conversions.h',
-        'origin_url_conversions.cc',
-        'origin_url_conversions.h',
         'webkit_base_export.h',
       ],
     },
   ],
 }