Roll src/third_party/webrtc db42ed299a4e..1a7a4afd139e (4 commits)

https://webrtc.googlesource.com/src.git/+log/db42ed299a4e..1a7a4afd139e


git log db42ed299a4e..1a7a4afd139e --date=short --no-merges --format='%ad %ae %s'
2019-02-27 titovartem@google.com Fix encoded image data injectors.
2019-02-27 ilnik@webrtc.org Fix video_loopback tool with different TL numbers in simulcast streams
2019-02-27 mbonadei@webrtc.org Fix more -Wextra-semi.
2019-02-27 artit@webrtc.org Remove iOS 9 support from mb config


Created with:
  gclient setdep -r src/third_party/webrtc@1a7a4afd139e

The AutoRoll server is located here: https://autoroll.skia.org/r/webrtc-chromium-autoroll

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

If the roll is causing failures, please contact the current sheriff, who should
be CC'd on the roll, and stop the roller if necessary.

CQ_INCLUDE_TRYBOTS=luci.chromium.try:linux_chromium_archive_rel_ng;luci.chromium.try:mac_chromium_archive_rel_ng

BUG=chromium:None,chromium:926235
TBR=webrtc-chromium-sheriffs-robots@google.com

Change-Id: Icc2a13f08578ed68e605b7a4c6d7bb0616a5708d
Reviewed-on: https://chromium-review.googlesource.com/c/1491753
Reviewed-by: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Commit-Queue: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#636037}
diff --git a/DEPS b/DEPS
index 8760041..7798eee 100644
--- a/DEPS
+++ b/DEPS
@@ -1265,7 +1265,7 @@
     Var('chromium_git') + '/external/khronosgroup/webgl.git' + '@' + 'a0f51b2e123f39c9ff12e621b0b47dd28dd64424',
 
   'src/third_party/webrtc':
-    Var('webrtc_git') + '/src.git' + '@' + 'db42ed299a4e865a889d8ff3aad495fd1f7a3ebb',
+    Var('webrtc_git') + '/src.git' + '@' + '1a7a4afd139e5b0ad91df5d7d2dae4a080fd6b9a',
 
   'src/third_party/xdg-utils': {
       'url': Var('chromium_git') + '/chromium/deps/xdg-utils.git' + '@' + 'd80274d5869b17b8c9067a1022e4416ee7ed5e0d',