Use -std=c++14 for GN bootstrap

See https://chromium.googlesource.com/chromium/src/+/5a9b923e371351d2ca64b47b9cac5f39d4fb7e86
(https://chromium-review.googlesource.com/583635) where chromium switched
to C++14.

Without this change, bootstrap fails.

Bug: none
Change-Id: I393ff80f9b0f504d1623f48e37c74802aaed12d3
Reviewed-on: https://chromium-review.googlesource.com/623671
Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Reviewed-by: Brett Wilson <brettw@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#496245}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 85bd0394c6825a810421698f0f9578de636761aa
1 file changed
tree: ce4c1ef07bb1d3f64098cbd31b8c1d276456f924
  1. tools/