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This reverts commit 4b053da1.

Reason for revert: breaks the build https://logs.chromium.org/logs/chromium/buildbucket/cr-buildbucket.appspot.com/8878975239685380208/+/steps/compile/0/stdout

Original change's description:
> [Fuchsia] Add WebGL MSAA to the allowed list for WebEngine
> 
> Now webgl-antialiasing-mode and webgl-msaa-sample-count can be
> specified in WebEngine config. This will allow to control MSAA support
> when using WebGL.
> 
> Bug: 766360
> Change-Id: If325bedefb31c1c960868563bcf223ba0bc88999
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2220865
> Auto-Submit: Sergey Ulanov <sergeyu@chromium.org>
> Reviewed-by: David Reveman <reveman@chromium.org>
> Reviewed-by: Wez <wez@chromium.org>
> Commit-Queue: Wez <wez@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#773101}

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

Change-Id: Ifb1e0fa7717e14424dce62a93b81602adca09435
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 766360
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2218317Reviewed-by: Olga Sharonova <olka@chromium.org>
Commit-Queue: Olga Sharonova <olka@chromium.org>
Cr-Commit-Position: refs/heads/master@{#773109}