Continue with the FreeBSD port - this version builds and links, though...

chrome/browser/chrome_thread.h

 // Copyright (c) 2006-2008 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_CHROME_THREAD_H__
 #define CHROME_BROWSER_CHROME_THREAD_H__
 
 #include "base/lock.h"
 #include "base/thread.h"
 
@@ skipping 30 matching lines @@
     // This is the thread that interacts with the database.
     DB,
 
     // This is the "main" thread for WebKit within the browser process when
     // NOT in --single-process mode.
     WEBKIT,
 
     // This is the thread that interacts with the history database.
     HISTORY,
 
-#if defined(OS_LINUX)
+#if defined(USE_X11)
     // This thread has a second connection to the X server and is used to
     // process UI requests when routing the request to the UI thread would risk
     // deadlock.
     BACKGROUND_X11,
 #endif
 
     // This identifier does not represent a thread.  Instead it counts the
     // number of well-known threads.  Insert new well-known threads before this
     // identifier.
     ID_COUNT
@@ skipping 41 matching lines @@
   static Lock lock_;
 
   // An array of the ChromeThread objects.  This array is protected by |lock_|.
   // The threads are not owned by this array.  Typically, the threads are owned
   // on the UI thread by the g_browser_process object.  ChromeThreads remove
   // themselves from this array upon destruction.
   static ChromeThread* chrome_threads_[ID_COUNT];
 };
 
 #endif  // #ifndef CHROME_BROWSER_CHROME_THREAD_H__