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This reverts commit 90f6b880.

Reason for revert: see 926185

Original change's description:
> gpu: support RGB10_A2 in copyTextureCHROMIUM
> 
> This CL extends the copyTextureCHROMIUM implementation to support
> RGB10_A2 (see bug for the use case).
> 
> It also extends gl_copy_texture_CHROMIUM_unittest.cc appropriately,
> and cleans it a tiny bit (const, removal of dead code, style).
> 
> For some reason, glCopy(Sub)TextureCHROMIUM() fails on Adreno 4xx,
> this CL adds a workaround for it, see crbug.com/925986.
> 
> Bug: 922198, 925986
> Change-Id: I8e4e95d766e89282cec1fc11e86c2c2fadc807fc
> Reviewed-on: https://chromium-review.googlesource.com/c/1418330
> Commit-Queue: Miguel Casas <mcasas@chromium.org>
> Reviewed-by: Antoine Labour <piman@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#626896}

TBR=mcasas@chromium.org,piman@chromium.org

Change-Id: Ib4702d6cf59885f7c4044977b2d28f9075b6e571
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 922198, 925986
Reviewed-on: https://chromium-review.googlesource.com/c/1443113Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#627007}