Remove Mojo bindings environment.

mojo/public/cpp/environment/lib/scoped_task_tracking.h

-// 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_ENVIRONMENT_LIB_SCOPED_TASK_TRACKING_H_
-#define MOJO_PUBLIC_CPP_ENVIRONMENT_LIB_SCOPED_TASK_TRACKING_H_
-
-#include "base/macros.h"
-#include "mojo/public/cpp/environment/task_tracker.h"
-
-namespace mojo {
-namespace internal {
-
-// An RAII wrapper for |TaskTrackingId|.
-class ScopedTaskTracking {
- public:
-  ScopedTaskTracking(const char* function_name,
-                     const char* file_name,
-                     int line,
-                     const void* program_counter);
-  ScopedTaskTracking(const char* function_name,
-                     const char* file_name,
-                     int line);
-  ~ScopedTaskTracking();
-
- private:
-  TaskTrackingId id_;
-  DISALLOW_COPY_AND_ASSIGN(ScopedTaskTracking);
-};
-
-}  // namespace internal
-}  // namespace mojo
-
-#endif  // MOJO_PUBLIC_CPP_ENVIRONMENT_LIB_SCOPED_TASK_TRACKING_H_