Remove RuntimeObject.lib dependency in Windows 10 Web MIDI backend

media/midi/BUILD.gn

Index: media/midi/BUILD.gn
diff --git a/media/midi/BUILD.gn b/media/midi/BUILD.gn
index 61ce3a0705a4dd649607a8bdde9f7059faacd33a..f3758563f3b65f7ff5e2d29154b3dc5e4e4710f1 100644
--- a/media/midi/BUILD.gn
+++ b/media/midi/BUILD.gn
@@ -137,19 +137,13 @@ component("midi") {
   }
 
   if (is_win) {
-    deps += [ "//device/usb" ]
-
     if (midi_use_winrt) {
       sources += [
         "midi_manager_winrt.cc",
         "midi_manager_winrt.h",
       ]
-
-      # TODO(crbug.com/642602): This adds runtime dependency to libraries that
-      # may not be available on Windows 7. Should eventually remove this and
-      # load functions dynamically (as in base::win::IsWindows10TabletMode).
-      libs += [ "runtimeobject.lib" ]
     } else {
+      deps += [ "//device/usb" ]
       sources += [
         "midi_manager_win.cc",
         "midi_manager_win.h",