Use SharedMemoryHandle instead ScopedHandle as ivar for SharedMemory

base/memory/shared_memory.h

 // 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.
 
 #ifndef BASE_MEMORY_SHARED_MEMORY_H_
 #define BASE_MEMORY_SHARED_MEMORY_H_
 
 #include <stddef.h>
 
 #include <string>
@@ skipping 223 matching lines @@
 #if defined(OS_POSIX) && !defined(OS_NACL) && !defined(OS_ANDROID) && \
     (!defined(OS_MACOSX) || defined(OS_IOS))
   bool FilePathForMemoryName(const std::string& mem_name, FilePath* path);
 #endif
 
 #if defined(OS_WIN)
   // If true indicates this came from an external source so needs extra checks
   // before being mapped.
   bool external_section_;
   std::wstring       name_;
-  win::ScopedHandle  mapped_file_;
 #else
-  // The OS primitive that backs the shared memory region.
-  SharedMemoryHandle shm_;
 
   // If valid, points to the same memory region as shm_, but with readonly
   // permissions.
   SharedMemoryHandle readonly_shm_;
 #endif
 
 #if defined(OS_MACOSX) && !defined(OS_IOS)
   // The mechanism by which the memory is mapped. Only valid if |memory_| is not
   // |nullptr|.
   SharedMemoryHandle::Type mapped_memory_mechanism_;
 #endif
 
+  // The OS primitive that backs the shared memory region.
+  SharedMemoryHandle shm_;
+
   size_t             mapped_size_;
   void*              memory_;
   bool               read_only_;
   size_t             requested_size_;
 
   DISALLOW_COPY_AND_ASSIGN(SharedMemory);
 };
 
 }  // namespace base
 
 #endif  // BASE_MEMORY_SHARED_MEMORY_H_