Remove base::StackString.

This was only used in one place and it turns out that StackString was
broken on Windows anyway due to the way that STL reserves buffers.

BUG=709273

Review-Url: https://codereview.chromium.org/2817223002
Cr-Original-Commit-Position: refs/heads/master@{#464764}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: eacc100de55e5b286aa8548b22c99c815cd69486
1 file changed
tree: e396e9c0c9629e7c5b30f1b4cc056b8cee6ffc78
  1. tools/