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This reverts commit 290037a8.

Reason for revert: Breaks compilation on lacros
https://ci.chromium.org/p/chromium/builders/ci/chromeos-amd64-generic-lacros-dbg/1132

Original change's description:
> Set use_dawn=true on Linux
>
> This enables WebGPU on Linux behind --enable-unsafe-webgpu
> and --enable-features=Vulkan. Shared image support requires
> SkiaRenderer (default on Linux) and Vulkan to be enabled.
>
> Bug: 976495
> Change-Id: I97065f2ac6aadd110971254bfe3526d366318b83
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2368534
> Commit-Queue: Austin Eng <enga@chromium.org>
> Reviewed-by: Kenneth Russell <kbr@chromium.org>
> Reviewed-by: Kai Ninomiya <kainino@chromium.org>
> Reviewed-by: Corentin Wallez <cwallez@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#817266}

TBR=kbr@chromium.org,cwallez@chromium.org,kainino@chromium.org,enga@chromium.org

Change-Id: I050e90c36094f047d4e311d467c603b47d2abf82
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 976495
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2473858Reviewed-by: Alexey Baskakov <loyso@chromium.org>
Commit-Queue: Alexey Baskakov <loyso@chromium.org>
Cr-Commit-Position: refs/heads/master@{#817308}