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

chrome/browser/chrome_content_browser_client.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_CHROME_CONTENT_BROWSER_CLIENT_H_
 #define CHROME_BROWSER_CHROME_CONTENT_BROWSER_CLIENT_H_
 
 #include <set>
 #include <string>
 #include <utility>
@@ skipping 213 matching lines @@
                                    WebPreferences* prefs) OVERRIDE;
   virtual void UpdateInspectorSetting(content::RenderViewHost* rvh,
                                       const std::string& key,
                                       const std::string& value) OVERRIDE;
   virtual void BrowserURLHandlerCreated(
       content::BrowserURLHandler* handler) OVERRIDE;
   virtual void ClearCache(content::RenderViewHost* rvh) OVERRIDE;
   virtual void ClearCookies(content::RenderViewHost* rvh) OVERRIDE;
   virtual base::FilePath GetDefaultDownloadDirectory() OVERRIDE;
   virtual std::string GetDefaultDownloadName() OVERRIDE;
+  virtual std::string GetDeviceIdSalt(content::ResourceContext* rc) OVERRIDE;
   virtual void DidCreatePpapiPlugin(
       content::BrowserPpapiHost* browser_host) OVERRIDE;
   virtual content::BrowserPpapiHost* GetExternalBrowserPpapiHost(
       int plugin_process_id) OVERRIDE;
   virtual bool SupportsBrowserPlugin(content::BrowserContext* browser_context,
                                      const GURL& site_url) OVERRIDE;
   virtual bool AllowPepperSocketAPI(
       content::BrowserContext* browser_context,
       const GURL& url,
       bool private_api,
@@ skipping 37 matching lines @@
 #endif
   scoped_ptr<extensions::BrowserPermissionsPolicyDelegate>
       permissions_policy_delegate_;
 
   DISALLOW_COPY_AND_ASSIGN(ChromeContentBrowserClient);
 };
 
 }  // namespace chrome
 
 #endif  // CHROME_BROWSER_CHROME_CONTENT_BROWSER_CLIENT_H_