Remove Mojo bindings environment.

mojo/public/cpp/environment/task_tracker.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_TASK_TRACKER_H_
-#define MOJO_PUBLIC_CPP_ENVIRONMENT_TASK_TRACKER_H_
-
-#include <stdint.h>
-
-namespace mojo {
-
-typedef intptr_t TaskTrackingId;
-
-// Interface for wiring task-level profiling. This API is mainly used by the
-// generated interface implementation.
-struct TaskTracker {
-  // Start tracking. The returned id must be reclaimed through |EndTracking()|.
-  TaskTrackingId (*StartTracking)(const char* function_name,
-                                  const char* file_name,
-                                  int line_number,
-                                  const void* program_counter);
-  // Finish tracking. The |id| is one that is returned from |StartTracking()|.
-  void (*EndTracking)(const TaskTrackingId id);
-  // Enable or disable tracking. It is disabled by default.
-  void (*SetEnabled)(bool enabled);
-};
-
-}  // namespace mojo
-
-#endif  // MOJO_PUBLIC_CPP_ENVIRONMENT_TASK_TRACKER_H_