Settings WebUI: Add back justify-content property for some cr-inputs

<cr-input> had a mixin of --cr-input-row-container that was incorrectly
defaulting the value of the `justify-content` property to normal. When
the mixin was removed, <cr-input>s that relied on that value broke.

Bug: 978337
Change-Id: I37aaf6e260f901714cd6b4068a2f785bb19d2179
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1676745
Reviewed-by: Hector Carmona <hcarmona@chromium.org>
Commit-Queue: John Lee <johntlee@chromium.org>
Cr-Commit-Position: refs/heads/master@{#672238}
2 files changed