[Win, MediaGallery] Enumerate and handle mtp device attach/detach events.

chrome/browser/system_monitor/removable_device_constants.cc

 // 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.
 
 #include "chrome/browser/system_monitor/removable_device_constants.h"
 
 namespace chrome {
 
 const char kFSUniqueIdPrefix[] = "UUID:";
 const char kVendorModelSerialPrefix[] = "VendorModelSerial:";
 
-#if defined(OS_LINUX)
-const char kLeftParen[] = "(";
-const char kRightParen[] = ")";
-const char kVendorModelVolumeStoragePrefix[] = "VendorModelVolumeStorage:";
-#endif
-
 const char kNonSpaceDelim[] = ":";
 const char kSpaceDelim[] = " ";
 
+const char kLeftParen[] = "(";
+const char kRightParen[] = ")";
+
+#if defined(OS_LINUX)
+const char kVendorModelVolumeStoragePrefix[] = "VendorModelVolumeStorage:";
+#endif
+
+#if defined(OS_WIN)
+const char16 kWPDDevInterfaceGUID[] = L"{6ac27878-a6fa-4155-ba85-f98f491d4f33}";
+#endif
+
 }  // namespace chrome