Made result_filefaceid output optional in FontConfigIPC::Match. There are cases when we are only in…

content/common/font_config_ipc_linux.cc

 // Copyright (c) 2012 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.
 
 #include "content/common/font_config_ipc_linux.h"
 
 #include <errno.h>
 #include <unistd.h>
 #include <fcntl.h>
 #include <sys/socket.h>
@@ skipping 52 matching lines @@
   uint32_t reply_filefaceid;
   std::string reply_family;
   bool resulting_bold, resulting_italic;
   if (!reply.ReadUInt32(&iter, &reply_filefaceid) ||
       !reply.ReadString(&iter, &reply_family) ||
       !reply.ReadBool(&iter, &resulting_bold) ||
       !reply.ReadBool(&iter, &resulting_italic)) {
     return false;
   }
 
-  *result_filefaceid = reply_filefaceid;
+  if (result_filefaceid)
+    *result_filefaceid = reply_filefaceid;
   if (result_family)
     *result_family = reply_family;
 
   if (is_bold)
     *is_bold = resulting_bold;
   if (is_italic)
     *is_italic = resulting_italic;
 
   return true;
 }
@@ skipping 17 matching lines @@
   PickleIterator iter(reply);
   if (!reply.ReadBool(&iter, &result) ||
       !result) {
     if (result_fd)
       close(result_fd);
     return -1;
   }
 
   return result_fd;
 }