Move the remaning files in content\common to the content namespace.

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>
 #include <sys/uio.h>
 
 #include "base/pickle.h"
 #include "base/posix/unix_domain_socket.h"
 
+namespace content {
+
 FontConfigIPC::FontConfigIPC(int fd)
     : fd_(fd) {
 }
 
 FontConfigIPC::~FontConfigIPC() {
   close(fd_);
 }
 
 bool FontConfigIPC::Match(std::string* result_family,
                           unsigned* result_filefaceid,
@@ skipping 76 matching lines @@
   PickleIterator iter(reply);
   if (!reply.ReadBool(&iter, &result) ||
       !result) {
     if (result_fd)
       close(result_fd);
     return -1;
   }
 
   return result_fd;
 }
+
+}  // namespace content