Roll src/third_party/libvpx/source/libvpx/ c094391e9..b8d86733e (5 commits)

https://chromium.googlesource.com/webm/libvpx.git/+log/c094391e954a..b8d86733e9d9

$ git log c094391e9..b8d86733e --date=short --no-merges --format='%ad %ae %s'
2019-09-20 marpan vp9-svc: Fix to forced key frame for spatial layers
2019-09-18 angiebird Remove redundant comment
2019-09-17 angiebird Move vp9_alloc_motion_field_info
2019-09-13 jianj Fix msan on svc tests.
2019-09-10 jzern vp9_quantize_sse2: quiet clang-7 integer sanitizer warning

Created with:
  roll-dep src/third_party/libvpx/source/libvpx
R=johannkoenig@google.com

Change-Id: Ibb8d76c787e652df8646253b2ebc48ab0ffcb2c7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1819328Reviewed-by: Johann Koenig <johannkoenig@google.com>
Commit-Queue: Jerome Jiang <jianj@google.com>
Cr-Commit-Position: refs/heads/master@{#699065}

DEPS

@@ -1146,7 +1146,7 @@ deps = {
   },
 
   'src/third_party/libvpx/source/libvpx':
-    Var('chromium_git') + '/webm/libvpx.git' + '@' +  'c094391e954aa274b9dcce3d6afcb5ba6bae7eff',
+    Var('chromium_git') + '/webm/libvpx.git' + '@' +  'b8d86733e9d9c58e17028720751f96dad2df7a09',
 
   'src/third_party/libwebm/source':
     Var('chromium_git') + '/webm/libwebm.git' + '@' + '51ca718c3adf0ddedacd7df25fe45f67dc5a9ce1',

third_party/libvpx/README.chromium

@@ -5,9 +5,9 @@ License: BSD
 License File: source/libvpx/LICENSE
 Security Critical: yes
 
-Date: Tuesday September 10 2019
+Date: Friday September 20 2019
 Branch: master
-Commit: c094391e954aa274b9dcce3d6afcb5ba6bae7eff
+Commit: b8d86733e9d9c58e17028720751f96dad2df7a09
 
 Description:
 Contains the sources used to compile libvpx binaries used by Google Chrome and

third_party/libvpx/source/config/vpx_version.h

@@ -2,7 +2,7 @@
 #define VERSION_MAJOR  1
 #define VERSION_MINOR  8
 #define VERSION_PATCH  1
-#define VERSION_EXTRA  "131-gc094391e95"
+#define VERSION_EXTRA  "139-gb8d86733e9"
 #define VERSION_PACKED ((VERSION_MAJOR<<16)|(VERSION_MINOR<<8)|(VERSION_PATCH))
-#define VERSION_STRING_NOSP "v1.8.1-131-gc094391e95"
-#define VERSION_STRING      " v1.8.1-131-gc094391e95"
+#define VERSION_STRING_NOSP "v1.8.1-139-gb8d86733e9"
+#define VERSION_STRING      " v1.8.1-139-gb8d86733e9"