Make default media device ID salts random by default

content/shell/browser/shell_browser_context.h

 // Copyright 2013 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 CONTENT_SHELL_BROWSER_SHELL_BROWSER_CONTEXT_H_
 #define CONTENT_SHELL_BROWSER_SHELL_BROWSER_CONTEXT_H_
 
 #include <memory>
+#include <string>
 
 #include "base/compiler_specific.h"
 #include "base/files/file_path.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "content/public/browser/browser_context.h"
 #include "content/public/browser/content_browser_client.h"
 #include "content/public/browser/resource_context.h"
 #include "content/shell/browser/shell_url_request_context_getter.h"
 #include "net/url_request/url_request_job_factory.h"
@@ skipping 49 matching lines @@
  protected:
   // Contains URLRequestContextGetter required for resource loading.
   class ShellResourceContext : public ResourceContext {
    public:
     ShellResourceContext();
     ~ShellResourceContext() override;
 
     // ResourceContext implementation:
     net::HostResolver* GetHostResolver() override;
     net::URLRequestContext* GetRequestContext() override;
+    SaltCallback GetMediaDeviceIDSalt() override;
 
     void set_url_request_context_getter(ShellURLRequestContextGetter* getter) {
       getter_ = getter;
     }
 
-  private:
+   private:
     ShellURLRequestContextGetter* getter_;
+    std::string media_device_id_salt_;
 
     DISALLOW_COPY_AND_ASSIGN(ShellResourceContext);
   };
 
   ShellURLRequestContextGetter* url_request_context_getter() {
     return url_request_getter_.get();
   }
 
   // Used by ShellBrowserContext to initiate and set different types of
   // URLRequestContextGetter.
@@ skipping 23 matching lines @@
   base::FilePath path_;
   BrowserPluginGuestManager* guest_manager_;
   scoped_refptr<ShellURLRequestContextGetter> url_request_getter_;
 
   DISALLOW_COPY_AND_ASSIGN(ShellBrowserContext);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_SHELL_BROWSER_SHELL_BROWSER_CONTEXT_H_