Separates PreviousSessionInfo testing interface

ios/chrome/ios_chrome.gyp

 # Copyright 2014 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,
   },
   'targets': [
     {
@@ skipping 358 matching lines @@
         'browser/metrics/ios_chrome_metrics_services_manager_client.h',
         'browser/metrics/ios_chrome_metrics_services_manager_client.mm',
         'browser/metrics/ios_chrome_origins_seen_service_factory.cc',
         'browser/metrics/ios_chrome_origins_seen_service_factory.h',
         'browser/metrics/ios_chrome_stability_metrics_provider.cc',
         'browser/metrics/ios_chrome_stability_metrics_provider.h',
         'browser/metrics/mobile_session_shutdown_metrics_provider.h',
         'browser/metrics/mobile_session_shutdown_metrics_provider.mm',
         'browser/metrics/previous_session_info.h',
         'browser/metrics/previous_session_info.mm',
+        'browser/metrics/previous_session_info_private.h',
         'browser/net/chrome_cookie_store_ios_client.h',
         'browser/net/chrome_cookie_store_ios_client.mm',
         'browser/net/connection_type_observer_bridge.h',
         'browser/net/connection_type_observer_bridge.mm',
         'browser/net/cookie_util.h',
         'browser/net/cookie_util.mm',
         'browser/net/crl_set_fetcher.cc',
         'browser/net/crl_set_fetcher.h',
         'browser/net/http_server_properties_manager_factory.cc',
         'browser/net/http_server_properties_manager_factory.h',
@@ skipping 476 matching lines @@
             '../../components/components.gyp:omnibox_browser',
             '../../components/components.gyp:rlz',
             '../../components/components.gyp:search_engines',
             '../../rlz/rlz.gyp:rlz_lib',
           ],
         },
       ],
     }],
   ],
 }