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This reverts commit fb37fef9.

Reason for revert: seems like this breaks the tree,
https://ci.chromium.org/p/chromium/builders/ci/mac-arm64-rel/1171?

Original change's description:
> Roll src/third_party/libjpeg_turbo/ 9d4f8005b..f38898135 (7 commits)
> 
> https://chromium.googlesource.com/chromium/deps/libjpeg_turbo.git/+log/9d4f8005bc6c..f38898135a3b
> 
> $ git log 9d4f8005b..f38898135 --date=short --no-merges --format='%ad %ae %s'
> 2020-07-01 jonathan.wright Implement quantization using Arm NEON intrinsics
> 2020-07-01 jonathan.wright Implement sample conversion using Arm NEON intrinsics
> 2020-08-25 jonathan.wright Add compiler-independent alignment macro
> 2020-07-01 jonathan.wright Add Arm NEON implementation of RGB->Grayscale
> 2020-07-01 jonathan.wright Implement RGB->YCbCr using Arm NEON intrinsics
> 2020-06-30 jonathan.wright Add Arm NEON implementation of h2v2_downsample
> 2020-06-30 jonathan.wright Add Arm NEON implementation of h2v1_downsample
> 
> Created with:
>   roll-dep src/third_party/libjpeg_turbo
> 
> Bug: 922430
> Change-Id: I4edeccd8e58a529a5a7198448877756e7f7b7e22
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2401461
> Reviewed-by: Leon Scroggins <scroggo@google.com>
> Commit-Queue: Jonathan Wright <jonathan.wright@arm.com>
> Cr-Commit-Position: refs/heads/master@{#805494}

TBR=scroggo@google.com,cblume@chromium.org,jonathan.wright@arm.com

Change-Id: I3386062045c36b44d7c9ef247dd009b978ccd3f0
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 922430
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2401585Reviewed-by: David Van Cleve <davidvc@chromium.org>
Commit-Queue: David Van Cleve <davidvc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#805503}