Add enum entry for Windows 10 RS2 (Creators Update)

base/win/windows_version.cc

Index: base/win/windows_version.cc
diff --git a/base/win/windows_version.cc b/base/win/windows_version.cc
index d192ab90ff7ef9f638ad483264f28001b989adfa..55745d2f4a3ddddaed5065b11b0a20030d687bec 100644
--- a/base/win/windows_version.cc
+++ b/base/win/windows_version.cc
@@ -52,8 +52,10 @@ Version MajorMinorBuildToVersion(int major, int minor, int build) {
       return VERSION_WIN10;
     } else if (build < 14393) {
       return VERSION_WIN10_TH2;
+    } else if (build < 15063) {
+      return VERSION_WIN10_RS1;
     } else {
-      return VERSION_WIN10_R1;
+      return VERSION_WIN10_RS2;
     }
   } else if (major > 6) {
     NOTREACHED();