Get rid of SharedMemory::GiveToProcess.

base/memory/shared_memory_handle_win.cc

Index: base/memory/shared_memory_handle_win.cc
diff --git a/base/memory/shared_memory_handle_win.cc b/base/memory/shared_memory_handle_win.cc
index 277a954daa1cd216c55c3b01333cc0fa4838d58a..82ded3453dd27af6afa76252dbb7f7bc1069a57d 100644
--- a/base/memory/shared_memory_handle_win.cc
+++ b/base/memory/shared_memory_handle_win.cc
@@ -40,6 +40,20 @@ bool SharedMemoryHandle::IsValid() const {
   return handle_ != nullptr;
 }
 
+SharedMemoryHandle SharedMemoryHandle::Duplicate() const {
+  DCHECK(BelongsToCurrentProcess());
+  HANDLE duped_handle;
+  ProcessHandle process = GetCurrentProcess();
+  BOOL success = ::DuplicateHandle(process, handle_, process, &duped_handle, 0,
+                                   FALSE, DUPLICATE_SAME_ACCESS);
+  if (!success)
+    return SharedMemoryHandle();
+
+  base::SharedMemoryHandle handle(duped_handle, GetCurrentProcId());
+  handle.SetOwnershipPassesToIPC(true);
+  return handle;
+}
+
 bool SharedMemoryHandle::BelongsToCurrentProcess() const {
   return pid_ == base::GetCurrentProcId();
 }