Get rid of SharedMemory::GiveToProcess.

base/memory/shared_memory_posix.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 "base/memory/shared_memory.h"
 
 #include <errno.h>
 #include <fcntl.h>
 #include <stddef.h>
 #include <sys/mman.h>
@@ skipping 343 matching lines @@
   return true;
 }
 #endif  // !defined(OS_ANDROID)
 
 SharedMemoryHandle SharedMemory::GetReadOnlyHandle() {
   CHECK(readonly_shm_.IsValid());
   return readonly_shm_.Duplicate();
 }
 
 bool SharedMemory::ShareToProcessCommon(ProcessHandle process,
-                                        SharedMemoryHandle* new_handle,
-                                        bool close_self) {
+                                        SharedMemoryHandle* new_handle) {
   *new_handle = shm_.Duplicate();
-  if (close_self) {
-    Unmap();
-    Close();
-  }
   return new_handle->IsValid();
 }
 
 bool SharedMemory::GetUniqueId(SharedMemory::UniqueId* id) const {
   // This function is called just after mmap. fstat is a system call that might
   // cause I/O. It's safe to call fstat here because mmap for shared memory is
   // called in two cases:
   // 1) To handle file-mapped memory
   // 2) To handle annonymous shared memory
   // In 1), I/O is already permitted. In 2), the backend is on page cache and
   // fstat doesn't cause I/O access to the disk. See the discussion at
   // crbug.com/604726#c41.
   base::ThreadRestrictions::ScopedAllowIO allow_io;
   struct stat file_stat;
   if (HANDLE_EINTR(
           ::fstat(static_cast<int>(handle().GetHandle()), &file_stat)) != 0)
     return false;
   id->first = file_stat.st_dev;
   id->second = file_stat.st_ino;
   return true;
 }
 
 }  // namespace base