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This is a reland of 3d9bdee7

The reland is unmodified since it was not the root cause of the problem that
motivated the initial revert.

Original change's description:
> Roll src/third_party/libvpx/source/libvpx/ cbe62b9c2..14dbdd95e (25 commits)
>
> https://chromium.googlesource.com/webm/libvpx.git/+log/cbe62b9c2d2b..14dbdd95e686
>
> $ git log cbe62b9c2..14dbdd95e --date=short --no-merges --format='%ad %ae %s'
> 2017-11-29 jianj Add frame width & height to frame pkt. Add test.
> 2017-12-06 marpan vp9-svc: Set downsampling filter for VGA layer.
> 2017-12-06 marpan vp9: Nonrd-pickmode: move some early exits up.
> 2017-12-01 marpan vp9-svc: Allow for nonzero motion on spatial reference.
> 2017-11-28 huisu Add max luma picture width/height constraint in VP9 level
> 2017-12-01 johannkoenig filter out asm includes
> 2017-12-01 johannkoenig explicitly label .text sections
> 2017-12-01 johannkoenig nasm defaults to -Ox
> 2017-12-01 johannkoenig pass 'win64' instead of 'x64' to the assembler
> 2017-12-01 marpan vp9-svc: Set num_inter_modes in non-rd pickmode.
> 2017-12-01 yinshiyou-hf vpx_dsp: [loongson] optimize variance v2.
> 2017-11-30 marpan Nonrd-pickmode: avoid duplicate computation of UV predictor.
> 2017-11-30 jzern decouple spatial-svc from encoder abi
> 2017-11-29 marpan Fix to copy partition.
> 2017-11-29 marpan vp9-svc: Don't allow encode_breakout on golden ref.
> 2017-11-29 marpan vp9-svc: Clean conditon for allowing copy_partition.
> 2017-11-29 kylesiefring Remove unnecessary includes of emmintrin_compat.h
> 2017-11-29 yinshiyou-hf vp8: [loongson] optimize regular quantize v2.
> 2017-11-29 kaustubh.raste mips msa optimize vpx_scaled_2d function
> 2017-11-29 yinshiyou-hf vp8: [loongson] optimize vp8_short_fdct4x4_mmi v2.
> (...)
>
> Created with:
>   roll-dep src/third_party/libvpx/source/libvpx
> R=johannkoenig@google.com
>
> BUG=webrtc:5749
>
> Change-Id: I2e26d723eaffb7fb999f4d1d77ea678519f0ef50
> Reviewed-on: https://chromium-review.googlesource.com/813088
> Reviewed-by: Johann Koenig <johannkoenig@google.com>
> Commit-Queue: Jerome Jiang <jianj@google.com>
> Cr-Commit-Position: refs/heads/master@{#522479}

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

Bug: webrtc:5749
Change-Id: I8476d1d156f59a12ebc1f08c01e84fc09971dd2a
Reviewed-on: https://chromium-review.googlesource.com/831587
Commit-Queue: Guido Urdaneta <guidou@chromium.org>
Reviewed-by: Guido Urdaneta <guidou@chromium.org>
Cr-Commit-Position: refs/heads/master@{#524678}