Fix get_toolchain_if_necessary.py --nodownload message formatting.

And indent properly as well.

Change-Id: I78e1f67d7820120bf809f1ac3ab64ce48c74e804
Reviewed-on: https://chromium-review.googlesource.com/c/1458784
Commit-Queue: Lei Zhang <thestig@chromium.org>
Reviewed-by: Scott Graham <scottmg@chromium.org>

win_toolchain/get_toolchain_if_necessary.py

@@ -496,8 +496,9 @@ def main():
   if desired_hash not in current_hashes:
     if options.no_download:
       raise SystemExit('Toolchain is out of date. Run "gclient runhooks" to '
-                      'update the toolchain, or set DEPOT_TOOLS_WIN_TOOLCHAIN=0'
-                      'to use the locally installed toolchain.')
+                       'update the toolchain, or set '
+                       'DEPOT_TOOLS_WIN_TOOLCHAIN=0 to use the locally '
+                       'installed toolchain.')
     should_use_file = False
     should_use_http = False
     should_use_gs = False