Revert "libyuv_r1711 roll for AR30/AB30 in ConvertToARGB"

This reverts commit aecf63d0.

Reason for revert: it broke everything.

Original change's description:
> libyuv_r1711 roll for AR30/AB30 in ConvertToARGB
> 
> Includes a fix for negative height on NV12
> 
> BUG=libyuv:799, libyuv:446
> TESTED=try bots build
> 
> Change-Id: I4c822d35ce801b2bbc5d2936877116c56a47dedf
> Reviewed-on: https://chromium-review.googlesource.com/1097601
> Reviewed-by: Miguel Casas <mcasas@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#567817}

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

Change-Id: Ic02b94abffe0f6018fc39114eccf4c0ebd670490
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: libyuv:799, libyuv:446
Reviewed-on: https://chromium-review.googlesource.com/1103397Reviewed-by: Andrii Shyshkalov <tandrii@chromium.org>
Commit-Queue: Andrii Shyshkalov <tandrii@chromium.org>
Cr-Commit-Position: refs/heads/master@{#567820}

DEPS

@@ -793,7 +793,7 @@ deps = {
     Var('chromium_git') + '/webm/libwebm.git' + '@' + '01c1d1d76f139345c442bfc8e61b4e1cba809059',
 
   'src/third_party/libyuv':
-    Var('chromium_git') + '/libyuv/libyuv.git' + '@' + 'd73ae64a2bddc80de8829a166bd7355fb4d6b208',  # from r1711
+    Var('chromium_git') + '/libyuv/libyuv.git' + '@' + '196e2e72a3190f539d5ad5f32c7b154154324951',  # from r1710
 
   'src/third_party/lighttpd': {
       'url': Var('chromium_git') + '/chromium/deps/lighttpd.git' + '@' + Var('lighttpd_revision'),