Update from https://crrev.com/308331

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 5d2fa2af9fccf217d47122c40f3252f1024f8b6a..20659ab97af7b1d3220c077d69435146db226f3e 100644
--- a/base/memory/shared_memory_win.cc
+++ b/base/memory/shared_memory_win.cc
@@ -71,6 +71,7 @@ SharedMemory::SharedMemory(SharedMemoryHandle handle, bool read_only,
 }
 
 SharedMemory::~SharedMemory() {
+  Unmap();
   Close();
   if (lock_ != NULL)
     CloseHandle(lock_);
@@ -249,11 +250,6 @@ bool SharedMemory::ShareToProcessCommon(ProcessHandle process,
 
 
 void SharedMemory::Close() {
-  if (memory_ != NULL) {
-    UnmapViewOfFile(memory_);
-    memory_ = NULL;
-  }
-
   if (mapped_file_ != NULL) {
     CloseHandle(mapped_file_);
     mapped_file_ = NULL;