Roll src/third_party/libyuv/ bc383e76d..4d67b3e85 (3 commits)

https://chromium.googlesource.com/libyuv/libyuv.git/+log/bc383e76d631..4d67b3e851b1

$ git log bc383e76d..4d67b3e85 --date=short --no-merges --format='%ad %ae %s'
2018-06-26 fbarchard Add H420 and H422 to ConvertToARGB()
2018-06-20 johannkoenig use unix line endings
2018-06-20 johannkoenig add const to msa loads

Created with:
  roll-dep src/third_party/libyuv

Bug: libyuv:799
Change-Id: I45facaa7902660ea064057c16030a836bbc11c9d
Reviewed-on: https://chromium-review.googlesource.com/1115873
Commit-Queue: Frank Barchard <fbarchard@chromium.org>
Reviewed-by: Frank Barchard <fbarchard@chromium.org>
Reviewed-by: Johann Koenig <johannkoenig@google.com>
Cr-Commit-Position: refs/heads/master@{#570619}

DEPS

@@ -815,7 +815,7 @@ deps = {
     Var('chromium_git') + '/webm/libwebm.git' + '@' + '01c1d1d76f139345c442bfc8e61b4e1cba809059',
 
   'src/third_party/libyuv':
-    Var('chromium_git') + '/libyuv/libyuv.git' + '@' + 'bc383e76d6316cf7ca59c76d18d0d7e61f007780',  # from r1711
+    Var('chromium_git') + '/libyuv/libyuv.git' + '@' + '4d67b3e851b1e057b8e3ac810e5f0c214f68751f',  # from r1712
 
   'src/third_party/lighttpd': {
       'url': Var('chromium_git') + '/chromium/deps/lighttpd.git' + '@' + Var('lighttpd_revision'),