Delete mojo::system::test::PostTaskAndWait().

mojo/edk/system/test_utils.cc

Index: mojo/edk/system/test_utils.cc
diff --git a/mojo/edk/system/test_utils.cc b/mojo/edk/system/test_utils.cc
index 420b08480d547996a8e4529234c6927074294c47..d43a8188dfcec9ba97c5476488d73cf35620904c 100644
--- a/mojo/edk/system/test_utils.cc
+++ b/mojo/edk/system/test_utils.cc
@@ -4,9 +4,6 @@
 
 #include "mojo/edk/system/test_utils.h"
 
-#include "base/bind.h"
-#include "base/callback.h"
-#include "base/synchronization/waitable_event.h"
 #include "base/test/test_timeouts.h"
 #include "build/build_config.h"
 
@@ -14,25 +11,6 @@ namespace mojo {
 namespace system {
 namespace test {
 
-namespace {
-
-void PostTaskAndWaitHelper(base::WaitableEvent* event,
-                           const base::Closure& task) {
-  task.Run();
-  event->Signal();
-}
-
-}  // namespace
-
-void PostTaskAndWait(scoped_refptr<base::TaskRunner> task_runner,
-                     const tracked_objects::Location& from_here,
-                     const base::Closure& task) {
-  base::WaitableEvent event(false, false);
-  task_runner->PostTask(from_here,
-                        base::Bind(&PostTaskAndWaitHelper, &event, task));
-  event.Wait();
-}
-
 base::TimeDelta EpsilonTimeout() {
 // Originally, our epsilon timeout was 10 ms, which was mostly fine but flaky on
 // some Windows bots. I don't recall ever seeing flakes on other bots. At 30 ms