win: Move NTDDI_VERSION into winver, stop setting it for usrsctp

third_party/usrsctp/BUILD.gn

Index: third_party/usrsctp/BUILD.gn
diff --git a/third_party/usrsctp/BUILD.gn b/third_party/usrsctp/BUILD.gn
index 4662796376561165d021ecf64297e9a3652a2805..7e65a69cef48d3c4ad3ae0c50b47ab50dacd61cc 100644
--- a/third_party/usrsctp/BUILD.gn
+++ b/third_party/usrsctp/BUILD.gn
@@ -123,16 +123,7 @@ static_library("usrsctp") {
   }
 
   if (is_win) {
-    defines += [
-      "__Userspace_os_Windows",
-
-      # Manually setting WINVER and _WIN32_WINNT is needed because Chrome
-      # sets WINVER to a newer version of  windows. But compiling usrsctp
-      # this way would is incompatible  with windows XP.
-      "WINVER=0x0502",
-      "_WIN32_WINNT=0x0502",
-    ]
-    configs -= [ "//build/config/win:winver" ]
+    defines += [ "__Userspace_os_Windows" ]
   } else {
     defines += [ "NON_WINDOWS_DEFINE" ]
   }