Reduce string copies in GURL creation

content/content_child.gypi

 # 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.
 
 {
   'dependencies': [
     '../base/base.gyp:base',
     '../components/mime_util/mime_util.gyp:mime_util',
     '../components/tracing.gyp:tracing',
     '../components/webcrypto/webcrypto.gyp:webcrypto',
@@ skipping 15 matching lines @@
     '../base/base.gyp:base',
   ],
   'variables': {
     'public_child_sources': [
       'public/child/child_thread.h',
       'public/child/fixed_received_data.cc',
       'public/child/fixed_received_data.h',
       'public/child/image_decoder_utils.h',
       'public/child/request_peer.h',
       'public/child/resource_dispatcher_delegate.h',
+      'public/child/url_conversion.cc',
+      'public/child/url_conversion.h',
       'public/child/v8_value_converter.h',
       'public/child/worker_thread.h',
     ],
     'private_child_sources': [
       'child/appcache/appcache_backend_proxy.cc',
       'child/appcache/appcache_backend_proxy.h',
       'child/appcache/appcache_dispatcher.cc',
       'child/appcache/appcache_dispatcher.h',
       'child/appcache/appcache_frontend_impl.cc',
       'child/appcache/appcache_frontend_impl.h',
@@ skipping 288 matching lines @@
         'child/npapi/webplugin_delegate_impl_mac.mm',
       ],
     }],
     ['OS=="win"', {
       'sources!': [
         'child/npapi/webplugin_delegate_impl_aura.cc',
       ],
     }],
   ],
 }