Build sync engine as part of the browser build

chrome/browser/sync/util/pthread_helpers.h

 // Copyright (c) 2009 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.
 
 #ifndef CHROME_BROWSER_SYNC_UTIL_PTHREAD_HELPERS_H_
 #define CHROME_BROWSER_SYNC_UTIL_PTHREAD_HELPERS_H_
 
 #include <pthread.h>
 #include "base/logging.h"
+#include "build/build_config.h"
 
-#ifdef OS_WINDOWS
+#ifdef OS_WIN
 typedef void* thread_handle;
 #else
 typedef pthread_t thread_handle;
 #endif
 
 // Creates a pthread, detaches from it, and returns a Win32 HANDLE for it that
 // the caller must CloseHandle().
 thread_handle CreatePThread(void* (*start)(void* payload), void* parameter);
 
 class PThreadRWLock {
@@ skipping 228 matching lines @@
 
 // Returns the absolute time ms milliseconds from now. Useful for passing
 // result to pthread_cond_timedwait().
 struct timespec GetPThreadAbsoluteTime(uint32 ms_from_now);
 
 // Assign a descriptive label to the current thread. This is useful to see
 // in a GUI debugger, but may not be implementable on all platforms.
 void NameCurrentThreadForDebugging(char* name);
 
 #endif  // CHROME_BROWSER_SYNC_UTIL_PTHREAD_HELPERS_H_