[Cleanup] Removed unused debugging code.

ios/chrome/browser/browser_state/chrome_browser_state_io_data.h

 // Copyright 2015 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.
 
 #ifndef IOS_CHROME_BROWSER_BROWSER_STATE_CHROME_BROWSER_STATE_IO_DATA_H_
 #define IOS_CHROME_BROWSER_BROWSER_STATE_CHROME_BROWSER_STATE_IO_DATA_H_
 
 #include <map>
 #include <memory>
 #include <string>
@@ skipping 289 matching lines @@
   // One URLRequestContext per isolated app for main and media requests.
   mutable URLRequestContextMap app_request_context_map_;
 
   mutable scoped_refptr<content_settings::CookieSettings> cookie_settings_;
 
   mutable scoped_refptr<HostContentSettingsMap> host_content_settings_map_;
 
   mutable std::unique_ptr<IOSChromeHttpUserAgentSettings>
       chrome_http_user_agent_settings_;
 
-  // TODO(jhawkins): Remove once crbug.com/102004 is fixed.
-  bool initialized_on_UI_thread_;
-
   const ios::ChromeBrowserStateType browser_state_type_;
 
   DISALLOW_COPY_AND_ASSIGN(ChromeBrowserStateIOData);
 };
 
 #endif  // IOS_CHROME_BROWSER_BROWSER_STATE_CHROME_BROWSER_STATE_IO_DATA_H_