[NOT COMMITTED] Inline TaskTraits' destructor per it only having POD type members

base/task_scheduler/task_traits.cc

 // Copyright 2016 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 "base/task_scheduler/task_traits.h"
 
 #include <ostream>
 
 namespace base {
 
 // Do not rely on defaults hard-coded below beyond the guarantees described in
 // the header; anything else is subject to change. Tasks should explicitly
 // request defaults if the behavior is critical to the task.
 TaskTraits::TaskTraits()
     : with_file_io_(false),
       priority_(TaskPriority::BACKGROUND),
       shutdown_behavior_(TaskShutdownBehavior::BLOCK_SHUTDOWN) {}
 
-TaskTraits::~TaskTraits() = default;
-
 TaskTraits& TaskTraits::WithFileIO() {
   with_file_io_ = true;
   return *this;
 }
 
 TaskTraits& TaskTraits::WithPriority(TaskPriority priority) {
   priority_ = priority;
   return *this;
 }
 
@@ skipping 28 matching lines @@
       os << "SKIP_ON_SHUTDOWN";
       break;
     case TaskShutdownBehavior::BLOCK_SHUTDOWN:
       os << "BLOCK_SHUTDOWN";
       break;
   }
   return os;
 }
 
 }  // namespace base