Revert of Verify if GPU message pump is signaled when it hangs in WaitForWork

base/message_loop/message_pump.cc

 // Copyright (c) 2010 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/message_loop/message_pump.h"
 
 namespace base {
 
 MessagePump::MessagePump() {
 }
 
 MessagePump::~MessagePump() {
 }
 
 void MessagePump::SetTimerSlack(TimerSlack) {
 }
 
-#if defined(OS_WIN)
-bool MessagePump::WasSignaled() {
-  NOTREACHED();
-  return false;
-}
-#endif
-
 }  // namespace base