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

chrome/browser/system_monitor/removable_device_constants.cc

Index: chrome/browser/system_monitor/removable_device_constants.cc
diff --git a/chrome/browser/system_monitor/removable_device_constants.cc b/chrome/browser/system_monitor/removable_device_constants.cc
index 5a1caf8c746d59f8c28b4c173b2ef5c3bfdf0d59..d06e6aa5ae2659d1d1c0a60a2421fcf9d4217027 100644
--- a/chrome/browser/system_monitor/removable_device_constants.cc
+++ b/chrome/browser/system_monitor/removable_device_constants.cc
@@ -9,13 +9,18 @@ namespace chrome {
 const char kFSUniqueIdPrefix[] = "UUID:";
 const char kVendorModelSerialPrefix[] = "VendorModelSerial:";
 
-#if defined(OS_LINUX)
+const char kNonSpaceDelim[] = ":";
+const char kSpaceDelim[] = " ";
+
 const char kLeftParen[] = "(";
 const char kRightParen[] = ")";
+
+#if defined(OS_LINUX)
 const char kVendorModelVolumeStoragePrefix[] = "VendorModelVolumeStorage:";
 #endif
 
-const char kNonSpaceDelim[] = ":";
-const char kSpaceDelim[] = " ";
+#if defined(OS_WIN)
+const char16 kWPDDevInterfaceGUID[] = L"{6ac27878-a6fa-4155-ba85-f98f491d4f33}";
+#endif
 
 }  // namespace chrome