Remove GTalk Pepper interfaces and related code.

ppapi/tests/test_talk_private.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 PAPPI_TESTS_TEST_TALK_PRIVATE_H_
-#define PAPPI_TESTS_TEST_TALK_PRIVATE_H_
-
-#include <string>
-
-#include "ppapi/c/private/ppb_talk_private.h"
-#include "ppapi/tests/test_case.h"
-
-class TestTalkPrivate : public TestCase {
- public:
-  explicit TestTalkPrivate(TestingInstance* instance);
-
-  // TestCase implementation.
-  virtual bool Init();
-  virtual void RunTests(const std::string& filter);
-
- private:
-  std::string TestGetPermission();
-
-  const PPB_Talk_Private_1_0* talk_private_interface_1;
-};
-
-#endif  // PPAPI_TESTS_TEST_TALK_PRIVATE_H_