Make SharedMemoryHandle a class on windows.

base/memory/BUILD.gn

 # Copyright (c) 2015 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.
 
 source_set("memory") {
   sources = [
     "aligned_memory.cc",
     "aligned_memory.h",
     "discardable_memory.cc",
     "discardable_memory.h",
@@ skipping 19 matching lines @@
     "ref_counted_delete_on_message_loop.h",
     "ref_counted_memory.cc",
     "ref_counted_memory.h",
     "scoped_policy.h",
     "scoped_ptr.h",
     "scoped_vector.h",
     "shared_memory.h",
     "shared_memory_android.cc",
     "shared_memory_handle.h",
     "shared_memory_handle_mac.cc",
+    "shared_memory_handle_win.cc",
     "shared_memory_mac.cc",
     "shared_memory_nacl.cc",
     "shared_memory_posix.cc",
     "shared_memory_win.cc",
     "singleton.cc",
     "singleton.h",
     "weak_ptr.cc",
     "weak_ptr.h",
   ]
   if (is_ios) {
@@ skipping 35 matching lines @@
   if (is_android) {
     deps = [
       "//third_party/ashmem",
     ]
   }
 
   configs += [ "//base:base_implementation" ]
 
   visibility = [ "//base/*" ]
 }