[Win10 sandbox mitigations] Four new Win10 mitigations added.

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 35cdbb3538ad61fb01c9b3cd672b204315175e03..7a8b8fdbdbaad6958759cdf603858d2387606bc5 100644
--- a/base/win/windows_version.cc
+++ b/base/win/windows_version.cc
@@ -65,7 +65,11 @@ OSInfo::OSInfo()
         break;
     }
   } else if (version_number_.major == 10) {
-    version_ = VERSION_WIN10;
+    if (version_number_.build < 10586) {
+      version_ = VERSION_WIN10;
+    } else {
+      version_ = VERSION_WIN10_TH2;
+    }
   } else if (version_number_.major > 6) {
     NOTREACHED();
     version_ = VERSION_WIN_LAST;