Remove old Sleep and PostDelayedTask interfaces that use int ms instead of TimeDelta.

base/threading/sequenced_worker_pool.h

Index: base/threading/sequenced_worker_pool.h
diff --git a/base/threading/sequenced_worker_pool.h b/base/threading/sequenced_worker_pool.h
index 740c26d78f0dd673ec3b19741e615ed0a055281d..73c670f00eb3e168d22720279acd11b4816676c8 100644
--- a/base/threading/sequenced_worker_pool.h
+++ b/base/threading/sequenced_worker_pool.h
@@ -231,9 +231,6 @@ class BASE_EXPORT SequencedWorkerPool : public TaskRunner {
   // TaskRunner implementation.  Forwards to PostWorkerTask().
   virtual bool PostDelayedTask(const tracked_objects::Location& from_here,
                                const Closure& task,
-                               int64 delay_ms) OVERRIDE;
-  virtual bool PostDelayedTask(const tracked_objects::Location& from_here,
-                               const Closure& task,
                                TimeDelta delay) OVERRIDE;
   virtual bool RunsTasksOnCurrentThread() const OVERRIDE;