Use SharedMemoryHandle instead ScopedHandle as ivar for SharedMemory

base/memory/shared_memory_handle.h

Index: base/memory/shared_memory_handle.h
diff --git a/base/memory/shared_memory_handle.h b/base/memory/shared_memory_handle.h
index d66c3c156180626ac4a9718fd1989b8012fd1b2f..57e67453872b745a0c6e118d5f21721882906a57 100644
--- a/base/memory/shared_memory_handle.h
+++ b/base/memory/shared_memory_handle.h
@@ -25,6 +25,8 @@
 
 namespace base {
 
+class SharedMemory;
+
 // SharedMemoryHandle is a platform specific type which represents
 // the underlying OS handle to a shared memory segment.
 class BASE_EXPORT SharedMemoryHandle {
@@ -100,8 +102,6 @@ class BASE_EXPORT SharedMemoryHandle {
   // mapped memory.
   bool MapAt(off_t offset, size_t bytes, void** memory, bool read_only);
 #elif defined(OS_WIN)
-  SharedMemoryHandle(HANDLE h);
-
   HANDLE GetHandle() const;
 #else
   // This constructor is deprecated, as it fails to propagate the GUID, which
@@ -154,6 +154,10 @@ class BASE_EXPORT SharedMemoryHandle {
     };
   };
 #elif defined(OS_WIN)
+  friend class SharedMemory;

[Nico, 2017/05/02 20:37:52]

:-(

+  // Takes implicit ownership of |h|.
+  SharedMemoryHandle(HANDLE h);
+
   HANDLE handle_;
 
   // Whether passing this object as a parameter to an IPC message passes