Use ContainsValue() instead of std::find() in tools/

BUG=561800

Review-Url: https://codereview.chromium.org/2938163003
Cr-Original-Commit-Position: refs/heads/master@{#480018}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 3e0d5228e24db43bb266c19ed82782be7239bb9b
4 files changed
tree: 0723b70859ee99d00d4824320978c4eb08d4a0e4
  1. tools/