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This reverts commit 34173c24.

Reason for revert: <INSERT REASONING HERE>

Original change's description:
> [Fuchsia] Disable fallback to SW compositing.
> 
> Previously WebEngine was falling back to SW compositing after 3
> GPU process crashes. This is not desirable when Vulkan is enabled
> because it may mask other issues. Also not all features work correctly
> with SW compositing (e.g. it's not compatible with HW video decoder).
> 
> Also added --disable-software-rasterizer to disable SwiftShader as
> we should never need to use it on Fuchsia.
> 
> Bug: 1021844
> Change-Id: I3257d9f0372789849a2922b514e6b23e08a380e0
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1854893
> Commit-Queue: Sergey Ulanov <sergeyu@chromium.org>
> Reviewed-by: Sergey Ulanov <sergeyu@chromium.org>
> Reviewed-by: Wez <wez@chromium.org>
> Reviewed-by: Jonathan Backer <backer@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#713063}

TBR=backer@chromium.org,wez@chromium.org,sergeyu@chromium.org

Change-Id: Ie22e4f3afcbf204dbdaf03f34ebb33254be51c0b
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1021844
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1900663Reviewed-by: Sergey Ulanov <sergeyu@chromium.org>
Commit-Queue: Sergey Ulanov <sergeyu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#713080}