Eliminate HAVE(ERRNO_H) guard.

Source/wtf/FastMalloc.cpp

 // Copyright (c) 2005, 2007, Google Inc.
 // All rights reserved.
 // Copyright (C) 2005, 2006, 2007, 2008, 2009, 2011 Apple 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:
 //
 //     * Redistributions of source code must retain the above copyright
 // notice, this list of conditions and the following disclaimer.
@@ skipping 393 matching lines @@
 #endif
 
 #else // FORCE_SYSTEM_MALLOC
 
 #include "Compiler.h"
 #include "TCPackedCache.h"
 #include "TCPageMap.h"
 #include "TCSpinLock.h"
 #include "TCSystemAlloc.h"
 #include <algorithm>
+#include <errno.h>
 #include <pthread.h>
 #include <stdarg.h>
 #include <stddef.h>
 #include <stdint.h>
 #include <stdio.h>
-#if HAVE(ERRNO_H)
-#include <errno.h>
-#endif
 #if OS(UNIX)
 #include <unistd.h>
 #endif
 #if OS(WINDOWS)
 #ifndef WIN32_LEAN_AND_MEAN
 #define WIN32_LEAN_AND_MEAN
 #endif
 #include <windows.h>
 #endif
 
@@ skipping 2523 matching lines @@
   lock_.Unlock();
   const size_t npages = class_to_pages[size_class_];
 
   Span* span;
   {
     SpinLockHolder h(&pageheap_lock);
     span = pageheap->New(npages);
     if (span) pageheap->RegisterSizeClass(span, size_class_);
   }
   if (span == NULL) {
-#if HAVE(ERRNO_H)
-    MESSAGE("allocation failed: %d\n", errno);
-#elif OS(WINDOWS)
+#if OS(WINDOWS)
     MESSAGE("allocation failed: %d\n", ::GetLastError());
 #else
-    MESSAGE("allocation failed\n");
+    MESSAGE("allocation failed: %d\n", errno);
 #endif
     lock_.Lock();
     return;
   }
   ASSERT_SPAN_COMMITTED(span);
   ASSERT(span->length == npages);
   // Cache sizeclass info eagerly.  Locking is not necessary.
   // (Instead of being eager, we could just replace any stale info
   // about this span, but that seems to be no better in practice.)
   for (size_t i = 0; i < npages; i++) {
@@ skipping 1179 matching lines @@
 void FastMallocZone::init()
 {
     static FastMallocZone zone(pageheap, &thread_heaps, static_cast<TCMalloc_Central_FreeListPadded*>(central_cache), &span_allocator, &threadheap_allocator);
 }
 
 #endif // OS(DARWIN)
 
 } // namespace WTF
 
 #endif // FORCE_SYSTEM_MALLOC