Remove Thread wrapper class in forwarder2.

tools/android/forwarder2/thread.cc

-// 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.
-
-#include "tools/android/forwarder2/thread.h"
-
-#include "base/logging.h"
-
-namespace forwarder2 {
-
-Thread::Thread() : thread_(static_cast<pthread_t>(-1)) {}
-
-Thread::~Thread() {}
-
-void Thread::Start() {
-  int ret = pthread_create(&thread_, NULL, &ThreadCallback, this);
-  CHECK_EQ(0, ret);
-}
-
-void Thread::Detach() {
-  CHECK_NE(static_cast<pthread_t>(-1), thread_);
-  int ret = pthread_detach(thread_);
-  CHECK_EQ(0, ret);
-}
-
-void Thread::Join() {
-  CHECK_NE(static_cast<pthread_t>(-1), thread_);
-  int ret = pthread_join(thread_, NULL);
-  CHECK_EQ(0, ret);
-}
-
-// static
-void* Thread::ThreadCallback(void* arg) {
-  CHECK(arg);
-  Thread* obj = reinterpret_cast<Thread*>(arg);
-  obj->Run();
-  return NULL;
-}
-
-}  // namespace forwarder