Remove worker pool names from TaskScheduler.TaskLatency.* histograms.

base/task_scheduler/scheduler_worker_pool_impl.h

Index: base/task_scheduler/scheduler_worker_pool_impl.h
diff --git a/base/task_scheduler/scheduler_worker_pool_impl.h b/base/task_scheduler/scheduler_worker_pool_impl.h
index b2dc68a4f12c96c79e8e27c41a4187b3a1c6b421..5d25ce1a6908e60f9a959c0df833df52cd430f70 100644
--- a/base/task_scheduler/scheduler_worker_pool_impl.h
+++ b/base/task_scheduler/scheduler_worker_pool_impl.h
@@ -11,7 +11,6 @@
 #include <string>
 #include <vector>
 
-#include "base/atomicops.h"
 #include "base/base_export.h"
 #include "base/callback.h"
 #include "base/logging.h"
@@ -28,12 +27,12 @@
 #include "base/task_scheduler/scheduler_worker_stack.h"
 #include "base/task_scheduler/sequence.h"
 #include "base/task_scheduler/task.h"
-#include "base/task_scheduler/task_traits.h"
 #include "base/threading/platform_thread.h"
 
 namespace base {
 
 class HistogramBase;
+class TaskTraits;
 class TimeDelta;
 
 namespace internal {
@@ -204,14 +203,6 @@ class BASE_EXPORT SchedulerWorkerPoolImpl : public SchedulerWorkerPool {
   // Intentionally leaked.
   HistogramBase* const num_tasks_between_waits_histogram_;
 
-  // TaskScheduler.TaskLatency.[worker pool name].[task priority] histograms.
-  // Indexed by task priority. Histograms are allocated on demand to reduce
-  // memory usage (some task priorities might never run in this
-  // SchedulerThreadPoolImpl). Intentionally leaked.
-  subtle::AtomicWord
-      task_latency_histograms_[static_cast<int>(TaskPriority::HIGHEST) + 1] =
-          {};
-
   TaskTracker* const task_tracker_;
   DelayedTaskManager* const delayed_task_manager_;