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This reverts commit 03d7e3ce.

Reason for revert: Reverting on behalf of titovartem@. Breaks WebRTC since vp9_svc_layercontext doesn't compile: https://logs.chromium.org/logs/webrtc/buildbucket/cr-buildbucket.appspot.com/8935991820767406272/+/steps/compile/0/stdout

Original change's description:
> Roll src/third_party/libvpx/source/libvpx/ 753fd86e8..4ddfa331c (26 commits)
> 
> https://chromium.googlesource.com/webm/libvpx.git/+log/753fd86e86ac..4ddfa331c4f5
> 
> $ git log 753fd86e8..4ddfa331c --date=short --no-merges --format='%ad %ae %s'
> 2018-09-05 huisu Initialize the best partition before partition RDO
> 2018-08-29 marpan vp9-svc: Allow for setting framerate per spatial layer.
> 2018-08-31 jingning Adaptive ARF factor decision
> 2018-08-29 jingning Recursive rate allocation for multi-layer ARF coding
> 2018-08-28 jingning Enable adaptive rate allocation for multi-layer ARFs
> 2018-09-04 huisu Move partition search ML models to a seperate file
> 2018-09-04 marpan vp9-svc: Fix to first_spatial_to_encode for pattern constraint.
> 2018-08-28 jingning Increase encoder buffer for multi-layer ARFs
> 2018-08-28 jingning Structure the multi-layer ARF locations
> 2018-09-03 paulwilkins Fix short first kf bug.
> 2018-08-27 jingning Assign target bits for multi-layer ARF system
> 2018-09-03 marpan vp9-svc: Add bypass flag to constrain inter_layer.
> 2018-09-03 paulwilkins Revert "Revert "Prevent double application of min rate in two pass.""
> 2018-09-02 marpan vp9-svc: Fix condition for pattern constraints
> 2018-08-27 jingning Properly update the raw_src_frame for psnr calculation
> 2018-08-25 jingning Build arf index stack
> 2018-08-31 marpan vp9-svc: Add first_spatial_layer_to_encode per superframe
> 2018-07-16 huisu ML based rectangular partition search pruning
> 2018-08-24 jingning Fix arf_src_offset calculation
> 2018-08-23 jingning Set minimum frame size to be 1 byte
> (...)
> 
> Created with:
>   roll-dep src/third_party/libvpx/source/libvpx
> R=​johannkoenig@google.com
> 
> Change-Id: Iabdcddd52bc1b080b87155333614cb0f07b34627
> Reviewed-on: https://chromium-review.googlesource.com/1214362
> Reviewed-by: Tom Finegan <tomfinegan@chromium.org>
> Commit-Queue: Jerome Jiang <jianj@google.com>
> Cr-Commit-Position: refs/heads/master@{#589741}

TBR=tomfinegan@chromium.org,johannkoenig@google.com,jianj@google.com

# Not skipping CQ checks because original CL landed > 1 day ago.

Change-Id: Ie1c41b10efa405e560d79a3755e4fbada743705c
Reviewed-on: https://chromium-review.googlesource.com/1219626Reviewed-by: Patrik Höglund <phoglund@chromium.org>
Commit-Queue: Patrik Höglund <phoglund@chromium.org>
Cr-Commit-Position: refs/heads/master@{#590287}