Remove the task tracking stuff in the bindings.

mojo/environment/default_task_tracker.cc

-// 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/environment/default_task_tracker.h"
-
-#include "base/logging.h"
-#include "mojo/common/task_tracker.h"
-#include "mojo/public/cpp/environment/task_tracker.h"
-
-namespace mojo {
-namespace internal {
-namespace {
-
-bool g_enabled = false;
-
-TaskTrackingId StartTracking(const char* function_name,
-                             const char* file_name,
-                             int line_number,
-                             const void* program_counter) {
-  if (!g_enabled)
-    return TaskTrackingId(0);
-
-  return common::TaskTracker::StartTracking(function_name, file_name,
-                                            line_number, program_counter);
-}
-
-void EndTracking(const TaskTrackingId id) {
-  if (!g_enabled) {
-    DCHECK_EQ(0, id);
-    return;
-  }
-
-  common::TaskTracker::EndTracking(id);
-}
-
-void SetEnabled(bool enabled) {
-  g_enabled = enabled;
-}
-
-}  // namespace
-
-const TaskTracker kDefaultTaskTracker = {&StartTracking,
-                                         &EndTracking,
-                                         &SetEnabled};
-
-}  // namespace internal
-}  // namespace mojo