Revert of Implement a simple ThreadChecker for Mojo and add to |internal::SharedData| and |internal::Router|.

third_party/mojo/src/mojo/public/cpp/bindings/lib/thread_checker_posix.cc

Index: third_party/mojo/src/mojo/public/cpp/bindings/lib/thread_checker_posix.cc
diff --git a/third_party/mojo/src/mojo/public/cpp/bindings/lib/thread_checker_posix.cc b/third_party/mojo/src/mojo/public/cpp/bindings/lib/thread_checker_posix.cc
deleted file mode 100644
index c8a16e24655952f8c786cf2b1337a422e178cb2b..0000000000000000000000000000000000000000
--- a/third_party/mojo/src/mojo/public/cpp/bindings/lib/thread_checker_posix.cc
+++ /dev/null
@@ -1,24 +0,0 @@
-// Copyright 2015 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 "mojo/public/cpp/bindings/lib/thread_checker_posix.h"
-
-#include <assert.h>
-
-namespace mojo {
-namespace internal {
-
-ThreadCheckerPosix::ThreadCheckerPosix() : attached_thread_id_(pthread_self()) {
-}
-
-ThreadCheckerPosix::~ThreadCheckerPosix() {
-  assert(CalledOnValidThread());
-}
-
-bool ThreadCheckerPosix::CalledOnValidThread() const {
-  return pthread_equal(pthread_self(), attached_thread_id_);
-}
-
-}  // namespace internal
-}  // namespace mojo