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This reverts commit 371290bf.

Reason for revert: Flexbox does not play well with the colors menu

Original change's description:
> [NTP] Position richer picker elements using flexbox
> 
> Position elements with flexbox instead of inline-block. This allows us
> to remove the "font-size: 0" hack that fixed the extra space between
> inline-block elements.
> 
> Change-Id: Ie3b6f02281795e60806259a00b2ee948df3b0959
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1725334
> Commit-Queue: Kristi Park <kristipark@chromium.org>
> Reviewed-by: Kyle Milka <kmilka@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#688355}

TBR=kristipark@chromium.org,kmilka@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Change-Id: I4a5a2a70e58e2d1d03d15505d9c5be5b866fe959
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1763340
Commit-Queue: Kristi Park <kristipark@chromium.org>
Reviewed-by: Kristi Park <kristipark@chromium.org>
Cr-Commit-Position: refs/heads/master@{#689196}