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This reverts commit 622d8879.

Reason for revert: 
infra failure
https://ci.chromium.org/p/chromium/builders/luci.chromium.ci/WebKit%20Linux%20MSAN

Original change's description:
> Drop Trusty from WebKit Linux builders
> 
> I applied following command to renmae
> $ git grep --name-only 'WebKit Linux Trusty ' testing/ infra/ | \
>   xargs sed -i 's/WebKit Linux Trusty /WebKit Linux /g'
> 
> This is step 3 written in
> https://chrome-internal-review.googlesource.com/c/infradata/config/+/1341927
> 
> Bug: 954450
> Change-Id: Ia29366bcdb60d7b28b44964a89d0033855866b8a
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1635069
> Reviewed-by: John Budorick <jbudorick@chromium.org>
> Reviewed-by: Ben Pastene <bpastene@chromium.org>
> Commit-Queue: Takuto Ikuta <tikuta@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#664591}

TBR=tikuta@chromium.org,bpastene@chromium.org,jbudorick@chromium.org

Change-Id: I86650591a406e54eda6c39d4c21eab832440b0ad
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 954450
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1636661Reviewed-by: Takuto Ikuta <tikuta@chromium.org>
Commit-Queue: Takuto Ikuta <tikuta@chromium.org>
Cr-Commit-Position: refs/heads/master@{#664610}