Roll chromium_revision de13cf4..28d1981 (299488:300483)

Mainly to pick up https://codereview.chromium.org/656293004/
to fix some MSan issues.

Summary of changes (https://chromium.googlesource.com/chromium/src/+/de13cf4..28d1981/DEPS):
* third_party/android_tools d2b8620..36bf7ac
* third_party/libyuv 455c66b..5a09c3e (1038:1130)
* third_party/usrsctp/usrsctplib a11b3c5..7accb99
* tools/gyp 1977:1990
* tools/swarming_client c28b74f..a57d7db

Clang updated 217949:218707 (git diff de13cf4..28d1981 tools/clang/scripts/update.sh)

R=pbos@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/31759004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@7489 4adac7df-926f-26a2-2b94-8c16560cd09d
diff --git a/DEPS b/DEPS
index 1417c68..7412ac1 100644
--- a/DEPS
+++ b/DEPS
@@ -9,7 +9,7 @@
   # Use this googlecode_url variable only if there is an internal mirror for it.
   # If you do not know, use the full path while defining your new deps entry.
   "googlecode_url": "http://%s.googlecode.com/svn",
-  "chromium_revision": "de13cf44ff5aa5815dd742c2cedcaece02601f4b",
+  "chromium_revision": "28d1981264903b186f5e9275c8f71d7943ccad7d",
 }
 
 # NOTE: Prefer revision numbers to tags for svn deps. Use http rather than