Make scoped enums output streamable.

base/task_scheduler/task_traits.cc

Index: base/task_scheduler/task_traits.cc
diff --git a/base/task_scheduler/task_traits.cc b/base/task_scheduler/task_traits.cc
index 5a0906402ecb251a2a8f3d83f00ae599c64d5bb5..d68ad676c07dc7850a007f805e3969a4a9c0843d 100644
--- a/base/task_scheduler/task_traits.cc
+++ b/base/task_scheduler/task_traits.cc
@@ -34,35 +34,4 @@ TaskTraits& TaskTraits::WithShutdownBehavior(
   return *this;
 }
 
-std::ostream& operator<<(std::ostream& os, const TaskPriority& task_priority) {
-  switch (task_priority) {
-    case TaskPriority::BACKGROUND:
-      os << "BACKGROUND";
-      break;
-    case TaskPriority::USER_VISIBLE:
-      os << "USER_VISIBLE";
-      break;
-    case TaskPriority::USER_BLOCKING:
-      os << "USER_BLOCKING";
-      break;
-  }
-  return os;
-}
-
-std::ostream& operator<<(std::ostream& os,
-                         const TaskShutdownBehavior& shutdown_behavior) {
-  switch (shutdown_behavior) {
-    case TaskShutdownBehavior::CONTINUE_ON_SHUTDOWN:
-      os << "CONTINUE_ON_SHUTDOWN";
-      break;
-    case TaskShutdownBehavior::SKIP_ON_SHUTDOWN:
-      os << "SKIP_ON_SHUTDOWN";
-      break;
-    case TaskShutdownBehavior::BLOCK_SHUTDOWN:
-      os << "BLOCK_SHUTDOWN";
-      break;
-  }
-  return os;
-}
-
 }  // namespace base