Abstract content::SessionStorageNamespace from core TabRestore code

components/sessions.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.
 
 {
   'variables': {
     # Core sources shared by sessions_content and sessions_ios. These can't
     # be a separate shared library since one symbol is implemented higher up in
     # the sessions_content/ios layer.
     'sessions_core_sources': [
@@ skipping 75 matching lines @@
             'SESSIONS_IMPLEMENTATION',
           ],
           'sources': [
             # Note: sources list duplicated in GN build.
             '<@(sessions_core_sources)',
 
             'sessions/content/content_serialized_navigation_builder.cc',
             'sessions/content/content_serialized_navigation_builder.h',
             'sessions/content/content_serialized_navigation_driver.cc',
             'sessions/content/content_serialized_navigation_driver.h',
+            'sessions/content/content_tab_client_data.cc',
+            'sessions/content/content_tab_client_data.h',
           ],
         },
       ],
     }, {  # OS==ios
       'targets': [
         {
           'target_name': 'sessions_ios',
           'type': 'static_library',
           'dependencies': [
             '../base/base.gyp:base',
@@ skipping 17 matching lines @@
             'sessions/ios/ios_serialized_navigation_builder.h',
             'sessions/ios/ios_serialized_navigation_driver.cc',
             'sessions/ios/ios_serialized_navigation_driver.h',
           ],
         },
       ],
     }],
   ],
 
 }