Move MediaDeviceIDSalt from ProfileIOData to ProfileImpl.

content/public/browser/browser_context.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 CONTENT_PUBLIC_BROWSER_BROWSER_CONTEXT_H_
 #define CONTENT_PUBLIC_BROWSER_BROWSER_CONTEXT_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <map>
 #include <memory>
+#include <string>
 #include <vector>
 
 #include "base/callback_forward.h"
 #include "base/containers/hash_tables.h"
 #include "base/memory/linked_ptr.h"
 #include "base/supports_user_data.h"
 #include "content/common/content_export.h"
 #include "content/public/browser/zoom_level_delegate.h"
 #include "content/public/common/push_event_payload.h"
 #include "content/public/common/push_messaging_status.h"
@@ skipping 141 matching lines @@
   static BrowserContext* GetBrowserContextForServiceUserId(
       const std::string& user_id);
 
   // Returns a Connector associated with this BrowserContext, which can be used
   // to connect to service instances bound as this user.
   static service_manager::Connector* GetConnectorFor(
       BrowserContext* browser_context);
   static ServiceManagerConnection* GetServiceManagerConnectionFor(
       BrowserContext* browser_context);
 
+  BrowserContext();
+
   ~BrowserContext() override;
 
   // Shuts down the storage partitions associated to this browser context.
   // This must be called before the browser context is actually destroyed
   // and before a clean-up task for its corresponding IO thread residents (e.g.
   // ResourceContext) is posted, so that the classes that hung on
   // StoragePartition can have time to do necessary cleanups on IO thread.
   void ShutdownStoragePartitions();
 
   // Creates a delegate to initialize a HostZoomMap and persist its information.
@@ skipping 60 matching lines @@
   virtual net::URLRequestContextGetter*
       CreateMediaRequestContextForStoragePartition(
           const base::FilePath& partition_path,
           bool in_memory) = 0;
 
   using StaticServiceMap = std::map<std::string, ServiceInfo>;
 
   // Registers per-browser-context services to be loaded in the browser process
   // by the Service Manager.
   virtual void RegisterInProcessServices(StaticServiceMap* services) {}
+
+  // Returns a random salt string that is used for creating media device IDs.
+  // Returns a random string by default.
+  virtual std::string GetMediaDeviceIDSalt();
+
+  // Utility function useful for embedders. Only needs to be called if
+  // 1) The embedder needs to use a new salt, and
+  // 2) The embedder saves its salt across restarts.
+  static std::string CreateRandomMediaDeviceIDSalt();
+
+ private:
+  const std::string media_device_id_salt_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_BROWSER_CONTEXT_H_