Implement 'Do Not Track' header

chrome/browser/profiles/profile_io_data.h

 // Copyright (c) 2012 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 CHROME_BROWSER_PROFILES_PROFILE_IO_DATA_H_
 #define CHROME_BROWSER_PROFILES_PROFILE_IO_DATA_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 210 matching lines @@
 
   // Lazy initializes the ProfileIOData object the first time a request context
   // is requested. The lazy logic is implemented here. The actual initialization
   // is done in LazyInitializeInternal(), implemented by subtypes. Static helper
   // functions have been provided to assist in common operations.
   void LazyInitialize() const;
 
   // Called when the profile is destroyed.
   void ShutdownOnUIThread();
 
-  BooleanPrefMember* enable_referrers() const {
-    return &enable_referrers_;
-  }
-
   ChromeURLDataManagerBackend* chrome_url_data_manager_backend() const {
     return chrome_url_data_manager_backend_.get();
   }
 
   // A ServerBoundCertService object is created by a derived class of
   // ProfileIOData, and the derived class calls this method to set the
   // server_bound_cert_service_ member and transfers ownership to the base
   // class.
   void set_server_bound_cert_service(
       net::ServerBoundCertService* server_bound_cert_service) const;
@@ skipping 108 matching lines @@
 
   // Tracks whether or not we've been lazily initialized.
   mutable bool initialized_;
 
   // Data from the UI thread from the Profile, used to initialize ProfileIOData.
   // Deleted after lazy initialization.
   mutable scoped_ptr<ProfileParams> profile_params_;
 
   // Member variables which are pointed to by the various context objects.
   mutable BooleanPrefMember enable_referrers_;
+  mutable BooleanPrefMember enable_do_not_track_;
   mutable BooleanPrefMember safe_browsing_enabled_;
   mutable BooleanPrefMember printing_enabled_;
   // TODO(marja): Remove session_startup_pref_ if no longer needed.
   mutable IntegerPrefMember session_startup_pref_;
 
   // The state of metrics reporting in the browser that this profile runs on.
   // Unfortunately, since ChromeOS has a separate representation of this state,
   // we need to make one available based on the platform.
 #if defined(OS_CHROMEOS)
   bool enable_metrics_;
@@ skipping 43 matching lines @@
 
   // TODO(jhawkins): Remove once crbug.com/102004 is fixed.
   bool initialized_on_UI_thread_;
 
   bool is_incognito_;
 
   DISALLOW_COPY_AND_ASSIGN(ProfileIOData);
 };
 
 #endif  // CHROME_BROWSER_PROFILES_PROFILE_IO_DATA_H_