Add the Copresence API.

chrome/browser/extensions/api/copresence_private/copresence_private_api.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 CHROME_BROWSER_EXTENSIONS_API_COPRESENCE_PRIVATE_COPRESENCE_PRIVATE_API_H_
 #define CHROME_BROWSER_EXTENSIONS_API_COPRESENCE_PRIVATE_COPRESENCE_PRIVATE_API_H_
 
 #include "chrome/browser/extensions/chrome_extension_function.h"
 
 namespace copresence {
@@ skipping 42 matching lines @@
     : public CopresencePrivateFunction {
  public:
   DECLARE_EXTENSION_FUNCTION("copresencePrivate.sendInitialized",
                              COPRESENCEPRIVATE_SENDINITIALIZED);
 
  protected:
   virtual ~CopresencePrivateSendInitializedFunction() {}
   virtual ExtensionFunction::ResponseAction Run() OVERRIDE;
 };
 
-// This will go away once we check in the code for the CopresenceAPI BCK
-// service which lets us inject a whispernet client.
-void SetWhispernetClientForTesting(copresence::WhispernetClient* client);
-
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_COPRESENCE_PRIVATE_COPRESENCE_PRIVATE_API_H_