Implement a salt for MediaSource IDs that can be cleared by a user.

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 15 matching lines @@
 #include "net/http/http_network_session.h"
 #include "net/url_request/url_request_job_factory.h"
 
 class ChromeHttpUserAgentSettings;
 class ChromeNetworkDelegate;
 class CookieSettings;
 class DesktopNotificationService;
 class ExtensionInfoMap;
 class HostContentSettingsMap;
 class ManagedModeURLFilter;
+class MediaDeviceIDSalt;
 class Profile;
 class ProtocolHandlerRegistry;
 class SigninNamesOnIOThread;
 class TransportSecurityPersister;
 
 namespace chrome_browser_net {
 class LoadTimeStats;
 class ResourcePrefetchPredictorObserver;
 }
 
@@ skipping 120 matching lines @@
   }
 
   BooleanPrefMember* sync_disabled() const {
     return &sync_disabled_;
   }
 
   BooleanPrefMember* signin_allowed() const {
     return &signin_allowed_;
   }
 
+  const std::string& media_device_id_salt() const;
+
   net::TransportSecurityState* transport_security_state() const {
     return transport_security_state_.get();
   }
 
   bool is_incognito() const {
     return is_incognito_;
   }
 
   chrome_browser_net::ResourcePrefetchPredictorObserver*
       resource_prefetch_predictor_observer() const {
@@ skipping 336 matching lines @@
   mutable scoped_refptr<HostContentSettingsMap> host_content_settings_map_;
 
   mutable scoped_ptr<chrome_browser_net::ResourcePrefetchPredictorObserver>
       resource_prefetch_predictor_observer_;
 
   mutable scoped_ptr<ChromeHttpUserAgentSettings>
       chrome_http_user_agent_settings_;
 
   mutable chrome_browser_net::LoadTimeStats* load_time_stats_;
 
+  mutable scoped_ptr<MediaDeviceIDSalt> media_device_id_salt_;
+
 #if defined(ENABLE_MANAGED_USERS)
   mutable scoped_refptr<const ManagedModeURLFilter> managed_mode_url_filter_;
 #endif
 
   // 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_