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This reverts commit 3b8a3ffc.

Reason for revert: Breaks bots.

Original change's description:
> Don't build seed corpora in most configs and delete duplicated config
> 
> Only build seed corpora where it is necessary, in order to reduce
> build sizes.
> 
> Bug: 952412
> Change-Id: I6e529226d4ba51fd547c1869525a9f094fdcd998
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1566454
> Reviewed-by: Max Moroz <mmoroz@chromium.org>
> Reviewed-by: Ben Pastene <bpastene@chromium.org>
> Commit-Queue: Jonathan Metzman <metzman@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#650506}

TBR=dpranke@chromium.org,mbarbella@chromium.org,mmoroz@chromium.org,bpastene@chromium.org,metzman@chromium.org

Change-Id: I1f826c43ced0959d6ef86a657d6b5ac2bdcc0110
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 952412
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1566728Reviewed-by: Jonathan Metzman <metzman@chromium.org>
Commit-Queue: Jonathan Metzman <metzman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#650530}