TaskScheduler: Remove base::ExecutionMode.

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 <stddef.h>
 
 #include <ostream>
 
@@ skipping 47 matching lines @@
       return "CONTINUE_ON_SHUTDOWN";
     case TaskShutdownBehavior::SKIP_ON_SHUTDOWN:
       return "SKIP_ON_SHUTDOWN";
     case TaskShutdownBehavior::BLOCK_SHUTDOWN:
       return "BLOCK_SHUTDOWN";
   }
   NOTREACHED();
   return "";
 }
 
-const char* ExecutionModeToString(ExecutionMode execution_mode) {
-  switch (execution_mode) {
-    case ExecutionMode::PARALLEL:
-      return "PARALLEL";
-    case ExecutionMode::SEQUENCED:
-      return "SEQUENCED";
-    case ExecutionMode::SINGLE_THREADED:
-      return "SINGLE_THREADED";
-  }
-  NOTREACHED();
-  return "";
-}
-
 std::ostream& operator<<(std::ostream& os, const TaskPriority& task_priority) {
   os << TaskPriorityToString(task_priority);
   return os;
 }
 
 std::ostream& operator<<(std::ostream& os,
                          const TaskShutdownBehavior& shutdown_behavior) {
   os << TaskShutdownBehaviorToString(shutdown_behavior);
   return os;
 }
 
-std::ostream& operator<<(std::ostream& os,
-                         const ExecutionMode& execution_mode) {
-  os << ExecutionModeToString(execution_mode);
-  return os;
-}
-
 }  // namespace base