Revert "Roll src/third_party/webrtc d574123c5035..6d800030ab7e (12 commits)"

This reverts commit f37f3783.

Reason for revert: broke fuzzing builds: crbug.com/885205

Original change's description:
> Roll src/third_party/webrtc d574123c5035..6d800030ab7e (12 commits)
> 
> Note: force submitting because of borked mac archive trybot.
> All other bots are green so we should be good.
> 
> https://webrtc.googlesource.com/src.git/+log/d574123c5035..6d800030ab7e
> 
> 
> git log d574123c5035..6d800030ab7e --date=short --no-merges --format='%ad %ae %s'
> 2018-09-17 mbonadei@webrtc.org Revert "Compile frame analyzer for the host machine on perf tests."
> 2018-09-17 mbonadei@webrtc.org Add RTC_EXPORT macro to export WebRTC symbols.
> 2018-09-17 mbonadei@webrtc.org Compile frame analyzer for the host machine on perf tests.
> 2018-09-17 buildbot@webrtc.org Roll chromium_revision 1d75f6fc..0eb6b522 (591373:591627)
> 2018-09-17 mbonadei@webrtc.org Rename RTC_EXPORT to RTC_OBJC_EXPORT.
> 2018-09-17 mbonadei@webrtc.org Introduce GN arg rtc_exclude_runtime_enabled_features_default.
> 2018-09-17 danilchap@webrtc.org Register video rtp header extensions in rtp_rtcp by uri
> 2018-09-17 sprang@webrtc.org Add ability to throttle VideoBitrateAllocation updates.
> 2018-09-17 mbonadei@webrtc.org Remove obsolete comments.
> 2018-09-17 saza@webrtc.org Reland "Remove APM internal usage of EchoCancellation"
> 2018-09-15 mbonadei@webrtc.org Merge field_trial and field_trial_default in a unique target.
> 2018-09-15 mbonadei@webrtc.org Merge system_wrappers:metrics and system_wrappers:metrics_default.
> 
> 
> Created with:
>   gclient setdep -r src/third_party/webrtc@6d800030ab7e
> 
> 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
> TBR=webrtc-chromium-sheriffs-robots@google.com
> 
> Change-Id: Id68bba413d71cbfb8cb52522b530e440249e459d
> Reviewed-on: https://chromium-review.googlesource.com/1229778
> Reviewed-by: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
> Cr-Commit-Position: refs/heads/master@{#591975}

TBR=phoglund@chromium.org,chromium-autoroll@skia-public.iam.gserviceaccount.com,webrtc-chromium-sheriffs-robots@google.com

Change-Id: I939c09c751590bef70e7bd6cf85b9089fc4a986f
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: chromium:None
Cq-Include-Trybots: luci.chromium.try:linux_chromium_archive_rel_ng;luci.chromium.try:mac_chromium_archive_rel_ng
Reviewed-on: https://chromium-review.googlesource.com/1231273Reviewed-by: Max Moroz <mmoroz@chromium.org>
Commit-Queue: Max Moroz <mmoroz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#592067}

DEPS

@@ -1098,7 +1098,7 @@ deps = {
     Var('chromium_git') + '/external/khronosgroup/webgl.git' + '@' + '7ca87fb1d3da3b3d2060886e8c58e726d74c8219',
 
   'src/third_party/webrtc':
-    Var('webrtc_git') + '/src.git' + '@' + '6d800030ab7efa0c0cb50efee737320d5f1c1d2e',
+    Var('webrtc_git') + '/src.git' + '@' + 'd574123c5035901107e4dd56a3cd0968f174a881',
 
   'src/third_party/xdg-utils': {
       'url': Var('chromium_git') + '/chromium/deps/xdg-utils.git' + '@' + 'd80274d5869b17b8c9067a1022e4416ee7ed5e0d',