Roll WebRTC 17863:17884 (14 commits)

Changes: https://chromium.googlesource.com/external/webrtc/trunk/webrtc.git/+log/9cdb538..ce4e632

$ git log 9cdb538..ce4e632 --date=short --no-merges --format=%ad %ae %s
2017-04-26 mbonadei@webrtc.org Reland of Creating webrtc/modules:module_api (patchset chromium#1 id:1 of https://codereview.webrtc.org/2839963005/ )
2017-04-26 ilnik@webrtc.org Fix default extension id for video content type extension
2017-04-26 magjed@webrtc.org ObjC: Split out I420 texture uploading into separate class
2017-04-26 mbonadei@webrtc.org Revert of Creating webrtc/modules:module_api (patchset chromium#5 id:80001 of https://codereview.webrtc.org/2838873002/ )
2017-04-26 mbonadei@webrtc.org Creating webrtc/modules:module_api
2017-04-26 nisse@webrtc.org Move autowrap from ThreadManager constructor to Thread::Current.
2017-04-26 mbonadei@webrtc.org Revert of Enable GN check for webrtc/base (patchset chromium#9 id:350001 of https://codereview.webrtc.org/2840453004/ )
2017-04-26 mbonadei@webrtc.org Reland of Enable GN check for webrtc/base (patchset chromium#3 id:230001 of https://codereview.webrtc.org/2838683002/ )
2017-04-26 brandtr@webrtc.org Use field_trial::IsEnabled for FlexFEC.
2017-04-25 mbonadei@webrtc.org Creating webrtc:video_stream_api
2017-04-25 philipp.hancke@googlemail.com Fix comment about remote restart being requested in createOffer
2017-04-25 kwiberg@webrtc.org Add SafeMin() and SafeMax(), which accept args of different types
2017-04-25 ilnik@webrtc.org Remove deprecated headers
2017-04-25 magjed@webrtc.org Android: Move EglBase10/EglBase14 from to API to src

TBR=
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_chromium_archive_rel_ng;master.tryserver.chromium.mac:mac_chromium_archive_rel_ng
BUG=

Review-Url: https://codereview.chromium.org/2842993002
Cr-Commit-Position: refs/heads/master@{#467308}

DEPS

@@ -232,7 +232,7 @@ 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' + '@' + '9cdb5386506ddbff3cbb096e9d2292c632ad915c', # commit position 17863
+    Var('chromium_git') + '/external/webrtc/trunk/webrtc.git' + '@' + 'ce4e632d4dd043996afe4402d4edf27186b33032', # commit position 17884
 
   'src/third_party/openmax_dl':
     Var('chromium_git') + '/external/webrtc/deps/third_party/openmax.git' + '@' +  Var('openmax_dl_revision'),