Move initialization of ChromeURLRequestContexts to the IO thread.

chrome/chrome.gyp

 # Copyright (c) 2009 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.
 
 {
   'variables': {
     'chromium_code': 1,
 
     'variables': {
       'version_py_path': 'tools/build/version.py',
@@ skipping 1726 matching lines @@
         'browser/metrics/metrics_service.cc',
         'browser/metrics/metrics_service.h',
         'browser/metrics/user_metrics.cc',
         'browser/metrics/user_metrics.h',
         'browser/modal_html_dialog_delegate.cc',
         'browser/modal_html_dialog_delegate.h',
         'browser/net/browser_url_util.cc',
         'browser/net/browser_url_util.h',
         'browser/net/chrome_url_request_context.cc',
         'browser/net/chrome_url_request_context.h',
+        'browser/net/url_request_context_getter.cc',
+        'browser/net/url_request_context_getter.h',
         'browser/net/dns_global.cc',
         'browser/net/dns_global.h',
         'browser/net/dns_host_info.cc',
         'browser/net/dns_host_info.h',
         'browser/net/dns_master.cc',
         'browser/net/dns_master.h',
         'browser/net/metadata_url_request.cc',
         'browser/net/metadata_url_request.h',
         'browser/net/referrer.cc',
         'browser/net/referrer.h',
@@ skipping 5168 matching lines @@
       ],  # targets when browser_sync==1
     }],
   ],  # 'conditions'
 }
 
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 # tab-width:2
 # indent-tabs-mode:nil
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