vs_toolchain.py: empty line between L15 and L16

Change-Id: I960d10e7c83169918e49bf923c6c32d6ffa1b5f7
Reviewed-on: https://chromium-review.googlesource.com/c/1317111
Commit-Queue: Yoshisato Yanagisawa <yyanagisawa@chromium.org>
Reviewed-by: Takuto Ikuta <tikuta@chromium.org>
Cr-Commit-Position: refs/heads/master@{#605281}

build/vs_toolchain.py

@@ -13,6 +13,7 @@ import shutil
 import stat
 import subprocess
 import sys
+
 from gn_helpers import ToGNString