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.h

Index: third_party/mojo/src/mojo/public/cpp/bindings/lib/thread_checker.h
diff --git a/third_party/mojo/src/mojo/public/cpp/bindings/lib/thread_checker.h b/third_party/mojo/src/mojo/public/cpp/bindings/lib/thread_checker.h
deleted file mode 100644
index da45d0a15f257760828ce8e0ed4082fb9fde4f17..0000000000000000000000000000000000000000
--- a/third_party/mojo/src/mojo/public/cpp/bindings/lib/thread_checker.h
+++ /dev/null
@@ -1,37 +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.
-
-#ifndef MOJO_PUBLIC_CPP_BINDINGS_LIB_THREAD_CHECKER_H_
-#define MOJO_PUBLIC_CPP_BINDINGS_LIB_THREAD_CHECKER_H_
-
-#include "mojo/public/cpp/system/macros.h"
-
-#if !defined(_WIN32)
-#include "mojo/public/cpp/bindings/lib/thread_checker_posix.h"
-#endif
-
-namespace mojo {
-namespace internal {
-
-class ThreadCheckerDoNothing {
- public:
-  bool CalledOnValidThread() const MOJO_WARN_UNUSED_RESULT {
-    return true;
-  }
-};
-
-// ThreadChecker is a class used to verify that some methods of a class are
-// called from the same thread. It is meant to be a member variable of a class.
-// The entire lifecycle of a ThreadChecker must occur on a single thread.
-// In Release mode (without dcheck_always_on), ThreadChecker does nothing.
-#if !defined(_WIN32) && (!defined(NDEBUG) || defined(DCHECK_ALWAYS_ON))
-using ThreadChecker = ThreadCheckerPosix;
-#else
-using ThreadChecker = ThreadCheckerDoNothing;
-#endif
-
-}  // namespace internal
-}  // namespace mojo
-
-#endif  // MOJO_PUBLIC_CPP_BINDINGS_LIB_THREAD_CHECKER_H_