Add the Copresence API.

components/copresence/public/copresence_client_delegate.h

 // Copyright 2014 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 COMPONENTS_COPRESENCE_PUBLIC_COPRESENCE_DELEGATE_H_
 #define COMPONENTS_COPRESENCE_PUBLIC_COPRESENCE_DELEGATE_H_
 
 #include <string>
 
 #include "base/callback_forward.h"
@@ skipping 19 matching lines @@
   // be sent to their respective apps.
   virtual void HandleMessages(
       const std::string& app_id,
       const std::string& subscription_id,
       const std::vector<copresence::Message>& message) = 0;
 
   virtual net::URLRequestContextGetter* GetRequestContext() const = 0;
 
   virtual const std::string GetPlatformVersionString() const = 0;
 
-  // Methods to set and and get our device ID. This needs to be saved to
-  // persistent storage to avoid flooding the Copresence server with generate
-  // id requests.
-  virtual const std::string GetDeviceId() const = 0;
-  virtual void SaveDeviceId(const std::string& device_id) = 0;
-
   virtual WhispernetClient* GetWhispernetClient() = 0;
 };
 
 }  // namespace copresence
 
 #endif  // COMPONENTS_COPRESENCE_PUBLIC_COPRESENCE_DELEGATE_H_