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This reverts commit 8d4df26b.

Reason for revert: 
Reverting for now -- this enables Finch configs for Lacros -- which in turn will turn on Vulkan backend for Skia, which can (sometimes) crash Lacros on launch.

Original change's description:
> Set "dev" channel for all lacros builds.
>
> Linux-chrome (of which lacros is a variant) has its channel set as a
> runtime environment variable by the launcher script. For Lacros, we must
> set the environment variable from ash. For now, we always set "dev" for
> all builds of Lacros.
>
> Change-Id: I840286b6fd5772701c3f6d927986405697b82097
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2570448
> Commit-Queue: Erik Chen <erikchen@chromium.org>
> Reviewed-by: James Cook <jamescook@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#833460}

TBR=jamescook@chromium.org,erikchen@chromium.org,chromium-scoped@luci-project-accounts.iam.gserviceaccount.com

Change-Id: I25d3d72d27571645ef9b1723e624e75859579d8b
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2574803Reviewed-by: Erik Chen <erikchen@chromium.org>
Commit-Queue: Erik Chen <erikchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#833801}