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

chrome/browser/chrome_content_browser_client.cc

 // 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.
 
 #include "chrome/browser/chrome_content_browser_client.h"
 
 #include <set>
 #include <utility>
 #include <vector>
 
@@ skipping 29 matching lines @@
 #include "chrome/browser/extensions/extension_system.h"
 #include "chrome/browser/extensions/extension_web_ui.h"
 #include "chrome/browser/extensions/extension_webkit_preferences.h"
 #include "chrome/browser/extensions/suggest_permission_util.h"
 #include "chrome/browser/geolocation/chrome_access_token_store.h"
 #include "chrome/browser/google/google_util.h"
 #include "chrome/browser/guestview/adview/adview_guest.h"
 #include "chrome/browser/guestview/guestview_constants.h"
 #include "chrome/browser/guestview/webview/webview_guest.h"
 #include "chrome/browser/media/media_capture_devices_dispatcher.h"
+#include "chrome/browser/media/media_device_id_salt.h"
 #include "chrome/browser/metrics/chrome_browser_main_extra_parts_metrics.h"
 #include "chrome/browser/nacl_host/nacl_browser.h"
 #include "chrome/browser/nacl_host/nacl_browser_delegate_impl.h"
 #include "chrome/browser/nacl_host/nacl_host_message_filter.h"
 #include "chrome/browser/nacl_host/nacl_process_host.h"
 #include "chrome/browser/net/chrome_net_log.h"
 #include "chrome/browser/notifications/desktop_notification_service.h"
 #include "chrome/browser/notifications/desktop_notification_service_factory.h"
 #include "chrome/browser/platform_util.h"
 #include "chrome/browser/plugins/plugin_info_message_filter.h"
@@ skipping 2313 matching lines @@
 }
 
 base::FilePath ChromeContentBrowserClient::GetDefaultDownloadDirectory() {
   return DownloadPrefs::GetDefaultDownloadDirectory();
 }
 
 std::string ChromeContentBrowserClient::GetDefaultDownloadName() {
   return l10n_util::GetStringUTF8(IDS_DEFAULT_DOWNLOAD_FILENAME);
 }
 
+std::string ChromeContentBrowserClient::GetDeviceIdSalt(

[Jói, 2013/10/31 16:14:47]

Should this name match the other, i.e. GetMediaDeviceIdSalt?

Also I think in the Content API the more common approach is to capitalize
abbreviations such as URL and ID, so this should then be GetMediaDeviceIDSalt.

[perkj_chrome, 2013/10/31 17:05:44]

Done.

+    content::ResourceContext* rc) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
+  ProfileIOData* io_data = ProfileIOData::FromResourceContext(rc);
+
+  return io_data->media_device_id_salt();
+}
+
 void ChromeContentBrowserClient::DidCreatePpapiPlugin(
     content::BrowserPpapiHost* browser_host) {
 #if defined(ENABLE_PLUGINS)
   browser_host->GetPpapiHost()->AddHostFactoryFilter(
       scoped_ptr<ppapi::host::HostFactory>(
           new ChromeBrowserPepperHostFactory(browser_host)));
 #endif
 }
 
 content::BrowserPpapiHost*
@@ skipping 245 matching lines @@
   return IsExtensionOrSharedModuleWhitelisted(url, extension_set,
                                               allowed_file_handle_origins_) ||
          IsHostAllowedByCommandLine(url, extension_set,
                                     switches::kAllowNaClFileHandleAPI);
 #else
   return false;
 #endif
 }
 
 }  // namespace chrome