Move content::MakeSharedMemorySegmentViaIPC into its own file

content/common/child_process_sandbox_support_impl_linux.cc

 // 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.
 
 #include "content/common/child_process_sandbox_support_impl_linux.h"
 
 #include <sys/stat.h>
 
 #include "base/eintr_wrapper.h"
 #include "base/global_descriptors_posix.h"
@@ skipping 69 matching lines @@
       reply.ReadInt(&pickle_iter, &useSubpixel)) {
     out->useBitmaps = useBitmaps;
     out->useAutoHint = useAutoHint;
     out->useHinting = useHinting;
     out->hintStyle = hintStyle;
     out->useAntiAlias = useAntiAlias;
     out->useSubpixel = useSubpixel;
   }
 }
 
-int MakeSharedMemorySegmentViaIPC(size_t length, bool executable) {
-  Pickle request;
-  request.WriteInt(LinuxSandbox::METHOD_MAKE_SHARED_MEMORY_SEGMENT);
-  request.WriteUInt32(length);
-  request.WriteBool(executable);
-  uint8_t reply_buf[10];
-  int result_fd;
-  ssize_t result = UnixDomainSocket::SendRecvMsg(GetSandboxFD(),
-                                                 reply_buf, sizeof(reply_buf),
-                                                 &result_fd, request);
-  if (result == -1)
-    return -1;
-  return result_fd;
-}
-
 int MatchFontWithFallback(const std::string& face, bool bold,
                           bool italic, int charset) {
   Pickle request;
   request.WriteInt(LinuxSandbox::METHOD_MATCH_WITH_FALLBACK);
   request.WriteString(face);
   request.WriteBool(bold);
   request.WriteBool(italic);
   request.WriteUInt32(charset);
   uint8_t reply_buf[64];
   int fd = -1;
@@ skipping 73 matching lines @@
 
   *output_length = length;
   n = HANDLE_EINTR(pread(fd, output, length, offset));
   if (n != static_cast<ssize_t>(length))
     return false;
 
   return true;
 }
 
 }  // namespace content