Move GetUnderlyingContainer() to //base/stl_util.h.

Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:linux_optional_gpu_tests_rel;luci.chromium.try:mac_optional_gpu_tests_rel;luci.chromium.try:win_optional_gpu_tests_rel
Change-Id: Icfa8de237dec762274179ecbfd7c342abf8829a6
Reviewed-on: https://chromium-review.googlesource.com/1060455
Commit-Queue: Dan Sanders <sandersd@chromium.org>
Reviewed-by: kylechar <kylechar@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#559726}

CrOS-Libchrome-Original-Commit: 97c137459f63cb470ceaa9d9081f3c5a676e4e3c
3 files changed
tree: 2600d2745ec2288f65987763cfa40597814d4f5d
  1. base/
  2. build/
  3. components/
  4. dbus/
  5. device/
  6. ipc/
  7. mojo/
  8. testing/
  9. third_party/
  10. ui/