Remove NTDDI_WIN10_RS2 check.

This check is already present here [1] so when WebRTC will be built
together with Chromium, NTDDI_WIN10_RS2 have to be defined even if WebRTC
doesn't check for it.

[1] - https://cs.chromium.org/chromium/src/base/win/windows_version.cc?l=24&rcl=091d55df46abb677d565d084064f837f819e92d5

Bug: None
Change-Id: I8bbda7b412b5904418f0e400f231dd816e6cbda3
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/128500
Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#27199}
diff --git a/rtc_base/win/windows_version.cc b/rtc_base/win/windows_version.cc
index 72aa5c6..8b007cc 100644
--- a/rtc_base/win/windows_version.cc
+++ b/rtc_base/win/windows_version.cc
@@ -20,14 +20,6 @@
 #error VS 2017 Update 3.2 or higher is required
 #endif
 
-#if !defined(NTDDI_WIN10_RS2)
-// Windows 10 Creators Update SDK is required to build Chrome. It is important
-// to install the 10.0.15063.468 version, released June 2017, because earlier
-// versions had bugs and could not build Chrome. See this link for details:
-// https://developercommunity.visualstudio.com/content/problem/42961/15063-sdk-is-broken-bitsh-indirectly-references-no.html
-#error Creators Update SDK (10.0.15063.468) required.
-#endif
-
 #if !defined(WINUWP)
 
 namespace {