RTC_[D]CHECK_op: Remove superfluous casts

webrtc/base/task_queue_win.cc

 /*
  *  Copyright 2016 The WebRTC Project Authors. All rights reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 43 matching lines @@
   Event event(false, false);
   ThreadStartupData startup = {&event, this};
   RTC_CHECK(thread_.QueueAPC(&InitializeQueueThread,
                              reinterpret_cast<ULONG_PTR>(&startup)));
   event.Wait(Event::kForever);
 }
 
 TaskQueue::~TaskQueue() {
   RTC_DCHECK(!IsCurrent());
   while (!PostThreadMessage(thread_.GetThreadRef(), WM_QUIT, 0, 0)) {
-    RTC_CHECK_EQ(static_cast<DWORD>(ERROR_NOT_ENOUGH_QUOTA), ::GetLastError());
+    RTC_CHECK_EQ(ERROR_NOT_ENOUGH_QUOTA, ::GetLastError());
     Sleep(1);
   }
   thread_.Stop();
 }
 
 // static
 TaskQueue* TaskQueue::Current() {
   return static_cast<TaskQueue*>(TlsGetValue(GetQueuePtrTls()));
 }
 
@@ skipping 113 matching lines @@
       }
     } else {
       TranslateMessage(&msg);
       DispatchMessage(&msg);
     }
   }
   return msg.message != WM_QUIT;
 }
 
 }  // namespace rtc