Implement exponential back-off mechanism and enforce it at the URLRequestHttpJob level.

chrome/chrome_common.gypi

 # 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.
 
 {
   'target_defaults': {
     'variables': {
       'chrome_common_target': 0,
     },
     'target_conditions': [
@@ skipping 433 matching lines @@
       'sources': [
         'common/net/http_return.h',
         'common/net/net_resource_provider.cc',
         'common/net/net_resource_provider.h',
         'common/net/predictor_common.h',
         'common/net/raw_host_resolver_proc.cc',
         'common/net/raw_host_resolver_proc.h',
         'common/net/socket_stream.h',
         'common/net/url_fetcher.cc',
         'common/net/url_fetcher.h',
-        'common/net/url_fetcher_protect.cc',
-        'common/net/url_fetcher_protect.h',
         'common/net/url_request_context_getter.cc',
         'common/net/url_request_context_getter.h',
         'common/net/url_request_intercept_job.cc',
         'common/net/url_request_intercept_job.h',
         'common/net/gaia/gaia_auth_consumer.h',
         'common/net/gaia/gaia_auth_fetcher.cc',
         'common/net/gaia/gaia_auth_fetcher.h',
         'common/net/gaia/gaia_authenticator.cc',
         'common/net/gaia/gaia_authenticator.h',
         'common/net/gaia/google_service_auth_error.h',
@@ skipping 106 matching lines @@
           'configurations': {
             'Common_Base': {
               'msvs_target_platform': 'x64',
             },
           },
         },
       ],
     }],
   ],
 }