Get rid of SharedMemory::GiveToProcess.

base/memory/shared_memory_win.cc

Index: base/memory/shared_memory_win.cc
diff --git a/base/memory/shared_memory_win.cc b/base/memory/shared_memory_win.cc
index 881e0609378565e4386234ff2a60347a68296d63..ffa7bd72bd1530d3f3180de8c73f328fc1663d24 100644
--- a/base/memory/shared_memory_win.cc
+++ b/base/memory/shared_memory_win.cc
@@ -185,18 +185,7 @@ size_t SharedMemory::GetHandleLimit() {
 // static
 SharedMemoryHandle SharedMemory::DuplicateHandle(
     const SharedMemoryHandle& handle) {
-  DCHECK(handle.BelongsToCurrentProcess());
-  HANDLE duped_handle;
-  ProcessHandle process = GetCurrentProcess();
-  BOOL success =
-      ::DuplicateHandle(process, handle.GetHandle(), process, &duped_handle, 0,
-                        FALSE, DUPLICATE_SAME_ACCESS);
-  if (success) {
-    base::SharedMemoryHandle handle(duped_handle, GetCurrentProcId());
-    handle.SetOwnershipPassesToIPC(true);
-    return handle;
-  }
-  return SharedMemoryHandle();
+  return handle.Duplicate();
 }
 
 bool SharedMemory::CreateAndMapAnonymous(size_t size) {
@@ -352,8 +341,7 @@ SharedMemoryHandle SharedMemory::GetReadOnlyHandle() {
 }
 
 bool SharedMemory::ShareToProcessCommon(ProcessHandle process,
-                                        SharedMemoryHandle* new_handle,
-                                        bool close_self) {
+                                        SharedMemoryHandle* new_handle) {
   *new_handle = SharedMemoryHandle();
   DWORD access = FILE_MAP_READ | SECTION_QUERY;
   DWORD options = 0;
@@ -361,18 +349,6 @@ bool SharedMemory::ShareToProcessCommon(ProcessHandle process,
   HANDLE result;
   if (!read_only_)
     access |= FILE_MAP_WRITE;
-  if (close_self) {
-    // DUPLICATE_CLOSE_SOURCE causes DuplicateHandle to close mapped_file.
-    options = DUPLICATE_CLOSE_SOURCE;
-    HANDLE detached_handle = mapped_file_.Take();
-    DCHECK_EQ(detached_handle, mapped_file);
-    Unmap();
-  }
-
-  if (process == GetCurrentProcess() && close_self) {
-    *new_handle = SharedMemoryHandle(mapped_file, base::GetCurrentProcId());
-    return true;
-  }
 
   if (!::DuplicateHandle(GetCurrentProcess(), mapped_file, process, &result,
                          access, FALSE, options)) {