Remove GTalk Pepper interfaces and related code.

ppapi/thunk/ppb_talk_private_api.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 PPAPI_THUNK_PPB_TALK_PRIVATE_API_H_
-#define PPAPI_THUNK_PPB_TALK_PRIVATE_API_H_
-
-#include "base/memory/ref_counted.h"
-#include "ppapi/c/private/ppb_talk_private.h"
-#include "ppapi/thunk/ppapi_thunk_export.h"
-
-namespace ppapi {
-
-class TrackedCallback;
-
-namespace thunk {
-
-class PPAPI_THUNK_EXPORT PPB_Talk_Private_API {
- public:
-  virtual ~PPB_Talk_Private_API() {}
-
-  virtual int32_t RequestPermission(
-      PP_TalkPermission permission,
-      scoped_refptr<TrackedCallback> callback) = 0;
-  virtual int32_t StartRemoting(
-      PP_TalkEventCallback event_callback,
-      void* user_data,
-      scoped_refptr<TrackedCallback> callback) = 0;
-  virtual int32_t StopRemoting(
-      scoped_refptr<TrackedCallback> callback) = 0;
-};
-
-}  // namespace thunk
-}  // namespace ppapi
-
-#endif  // PPAPI_THUNK_PPB_TALK_PRIVATE_API_H_