GitLab

This will enable us to simplify some code. e.g.
- Merge WebFileChooserParams and FileChooserSettings
- Merge WebFileChooserCompletion::SelectedFileInfo and
  FileChooserFileInfo


Change-Id: Id6d2982d6fae1082edaf6f7cb405b228e17227df
Reviewed-on: https://chromium-review.googlesource.com/624832Reviewed-by: Keishi Hattori <keishi@chromium.org>
Commit-Queue: Kent Tamura <tkent@chromium.org>
Cr-Commit-Position: refs/heads/master@{#496588}