Revert of Roll WebRTC 12336:12346 (patchset chromium#1 id:1 of https:…

…//codereview.chromium.org/1887553003/ )

Reason for revert:
WebRTC 12338 introduced a lot of static initializers. I commented with more detail on the CL.

Original issue's description:
> Roll WebRTC 12336:12346
>
> WebRTC 12336:12346
>
> Changes: https://chromium.googlesource.com/external/webrtc/trunk/webrtc.git/+log/57d7e7b..86b444b
>
> TBR=
> BUG=
>
> Committed: https://crrev.com/1f885efec76c596e19ec38c82afb7edb282b79d3
> Cr-Commit-Position: refs/heads/master@{#387005}

TBR=guidou@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=

Review URL: https://codereview.chromium.org/1890473003

Cr-Commit-Position: refs/heads/master@{#387021}

DEPS

@@ -220,7 +220,7 @@ deps = {
    Var('chromium_git') + '/native_client/src/third_party/scons-2.0.1.git' + '@' + '1c1550e17fc26355d08627fbdec13d8291227067',
 
   'src/third_party/webrtc':
-    Var('chromium_git') + '/external/webrtc/trunk/webrtc.git' + '@' + '86b444baa35848588e4bc030adf6aca31b6038ef', # commit position 12346
+    Var('chromium_git') + '/external/webrtc/trunk/webrtc.git' + '@' + '57d7e7b1f6f36ec8eb8a3380582dc58588a8def5', # commit position 12336
 
   'src/third_party/openmax_dl':
     Var('chromium_git') + '/external/webrtc/deps/third_party/openmax.git' + '@' +  Var('openmax_dl_revision'),