Fix Windows build warning

media/midi/midi_manager_winrt.cc

 // Copyright 2016 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.
 
 #include "media/midi/midi_manager_winrt.h"
 
 // TODO(shaochuan): Remove this once clang supports uuid syntax in <robuffer.h>.
 // https://reviews.llvm.org/D23895
 namespace Windows {
 namespace Storage {
 namespace Streams {
+#pragma warning(disable : 4467)
 struct __declspec(uuid("905a0fef-bc53-11df-8c49-001e4fc686da"))
     IBufferByteAccess;
 }
 }
 }
 
 #include <comdef.h>
 #include <robuffer.h>
 #include <windows.devices.enumeration.h>
 #include <windows.devices.midi.h>
@@ skipping 929 matching lines @@
 void MidiManagerWinrt::OnPortManagerReady() {
   DCHECK(com_thread_checker_->CalledOnValidThread());
   DCHECK(port_manager_ready_count_ < 2);
 
   if (++port_manager_ready_count_ == 2)
     CompleteInitialization(Result::OK);
 }
 
 }  // namespace midi
 }  // namespace media