Remove UnusedParam.h

Source/wtf/ThreadingWin.cpp

 /*
  * Copyright (C) 2007, 2008 Apple Inc. All rights reserved.
  * Copyright (C) 2009 Google Inc. All rights reserved.
  * Copyright (C) 2009 Torch Mobile, Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
@@ skipping 200 matching lines @@
     unsigned threadIdentifier = 0;
     ThreadIdentifier threadID = 0;
     OwnPtr<ThreadFunctionInvocation> invocation = adoptPtr(new ThreadFunctionInvocation(entryPoint, data));
     HANDLE threadHandle = reinterpret_cast<HANDLE>(_beginthreadex(0, 0, wtfThreadEntryPoint, invocation.get(), 0, &threadIdentifier));
     if (!threadHandle) {
         WTF_LOG_ERROR("Failed to create thread at entry point %p with data %p: %ld", entryPoint, data, errno);
         return 0;
     }
 
     // The thread will take ownership of invocation.
-    ThreadFunctionInvocation* leakedInvocation = invocation.leakPtr();
-    UNUSED_PARAM(leakedInvocation);
+    ThreadFunctionInvocation* ALLOW_UNUSED leakedInvocation = invocation.leakPtr();
 
     threadID = static_cast<ThreadIdentifier>(threadIdentifier);
     storeThreadHandleByIdentifier(threadIdentifier, threadHandle);
 
     return threadID;
 }
 
 int waitForThreadCompletion(ThreadIdentifier threadID)
 {
     ASSERT(threadID);
@@ skipping 251 matching lines @@
     // Time is too far in the future (and would overflow unsigned long) - wait forever.
     if (absoluteTime - currentTime > static_cast<double>(INT_MAX) / 1000.0)
         return INFINITE;
 
     return static_cast<DWORD>((absoluteTime - currentTime) * 1000.0);
 }
 
 } // namespace WTF
 
 #endif // OS(WIN)