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

base/task_scheduler/scheduler_worker.h

Index: base/task_scheduler/scheduler_worker.h
diff --git a/base/task_scheduler/scheduler_worker.h b/base/task_scheduler/scheduler_worker.h
index 1b81b03faaad9b623a5955425c292fc2b49c2efa..f75d45f25db95d3f5c1009726274f30d7d1f9eab 100644
--- a/base/task_scheduler/scheduler_worker.h
+++ b/base/task_scheduler/scheduler_worker.h
@@ -53,11 +53,8 @@ class BASE_EXPORT SchedulerWorker {
     // run a Task.
     virtual scoped_refptr<Sequence> GetWork(SchedulerWorker* worker) = 0;
 
-    // Called by the SchedulerWorker after it ran a task with |task_priority|.
-    // |task_latency| is the time elapsed between when the task was posted and
-    // when it started to run.
-    virtual void DidRunTaskWithPriority(TaskPriority task_priority,
-                                        TimeDelta task_latency) = 0;
+    // Called by the SchedulerWorker after it ran a task.
+    virtual void DidRunTask() = 0;
 
     // Called when |sequence| isn't empty after the SchedulerWorker pops a Task
     // from it. |sequence| is the last Sequence returned by GetWork().