Roll src/third_party/webrtc fc3587418d3b..2449d7aa7828 (2 commits)

https://webrtc.googlesource.com/src.git/+log/fc3587418d3b..2449d7aa7828

git log fc3587418d3b..2449d7aa7828 --date=short --no-merges --format='%ad %ae %s'
2019-09-30 nisse@webrtc.org Refactor legacy FrameBuffer to use EncodedImageBuffer::Realloc
2019-09-30 ilnik@webrtc.org Video: Log scalability configuration on encoder reconfigure

Created with:
  gclient setdep -r src/third_party/webrtc@2449d7aa7828

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/webrtc-chromium-autoroll
Please CC webrtc-chromium-sheriffs-robots@google.com on the revert to ensure that a human
is aware of the problem.

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

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

TBR=webrtc-chromium-sheriffs-robots@google.com

Bug: chromium:none
Change-Id: I7ef0dc051a2e093d9e3fdcc77cec778a12c6c79b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1830515Reviewed-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@{#701077}

DEPS

@@ -1459,7 +1459,7 @@ deps = {
     Var('chromium_git') + '/external/khronosgroup/webgl.git' + '@' + '7c4e67ff117d6c640e6dd17989afe2fb7da7eecb',
 
   'src/third_party/webrtc':
-    Var('webrtc_git') + '/src.git' + '@' + 'fc3587418d3b303a5286c8eb4cf721091061bea5',
+    Var('webrtc_git') + '/src.git' + '@' + '2449d7aa78282a74ba297fc67d01517d344122cc',
 
   'src/third_party/xdg-utils': {
       'url': Var('chromium_git') + '/chromium/deps/xdg-utils.git' + '@' + 'd80274d5869b17b8c9067a1022e4416ee7ed5e0d',