[mb] specify compile_only config to win_chromium_compile_dbg_ng

This is for faster compile step time by dropping debug symbols.
Higher symbol level seems to cause slow link time.
e.g.
https://chromium-build-stats.appspot.com/ninja_log/2019/07/23/win-chromium-compile-dbg-ng-37-nyxn/ninja_log.win-chromium-compile-dbg-ng-37-nyxn.chrome-bot.20190723-064013.9724.gz/trace_sort_by_end.html
from
https://ci.chromium.org/p/chromium/builders/try/win_chromium_compile_dbg_ng/347566

Bug: 794423
Change-Id: I393d5aae685fba158e7c4be7d7f25ab79b46dd7b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1714371
Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Commit-Queue: Takuto Ikuta <tikuta@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#680109}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 1b96b920807aad25eb53e294f77c51472c946780
1 file changed