Replace OS_LINUX ifdefs with OS_POSIX & !OS_MACOSX, TOOLKIT_USES_GTK, or

content/browser/content_browser_client.h

 // Copyright (c) 2011 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 CONTENT_BROWSER_CONTENT_BROWSER_CLIENT_H_
 #define CONTENT_BROWSER_CONTENT_BROWSER_CLIENT_H_
 #pragma once
 
 #include <string>
 
@@ skipping 91 matching lines @@
                               int render_process_id,
                               int render_view_id,
                               net::CookieOptions* options);
 
   // Create and return a new quota permission context.
   virtual QuotaPermissionContext* CreateQuotaPermissionContext();
 
   // Shows the given path using the OS file manager.
   virtual void RevealFolderInOS(const FilePath& path);
 
-#if defined(OS_LINUX)
+#if defined(OS_POSIX) && !defined(OS_MACOSX)
   // Can return an optional fd for crash handling, otherwise returns -1.
   virtual int GetCrashSignalFD(const std::string& process_type);
 #endif
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_CONTENT_BROWSER_CLIENT_H_