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kLoginLayoutWhitelist has a list of xkb layout ids that are allowed to
be used on login screen.
However, the same information is already in
//chromeos/ime/input_methods.txt.
This CL removes the array and use the infomation in input_methods.txt
instead.

There is a slight diff between kLoginLayoutWhitelist and
input_methods.txt.
- 'fr' is only in kLoginLayoutWhitelist and xkb_manifest.json uses it.
  I updated xkb_manifest.json to use 'fr(oss)'.
- 'ro(std)' and 'ga' is specified as login layouts in input_methods.txt,
  but not in kLoginLayoutWhitelist. They are considered as login layout
  after this CL.

Bug: None
Change-Id: Ic88846555310e3c534e64dd195bd47aa80befa42
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1490986Reviewed-by: Shu Chen <shuchen@chromium.org>
Commit-Queue: Yuichiro Hanada <yhanada@chromium.org>
Cr-Commit-Position: refs/heads/master@{#638483}