Roll chromium_revision d47c242..df4218d (352743:352811)

Change log: https://chromium.googlesource.com/chromium/src/+log/d47c242..df4218d
Full diff: https://chromium.googlesource.com/chromium/src/+/d47c242..df4218d

No dependencies changed.
No update to Clang.

TBR=
CQ_EXTRA_TRYBOTS=tryserver.webrtc:win_baremetal,mac_baremetal,linux_baremetal

Review URL: https://codereview.webrtc.org/1389293002

Cr-Commit-Position: refs/heads/master@{#10198}
diff --git a/DEPS b/DEPS
index d77f0a4..fc27155 100644
--- a/DEPS
+++ b/DEPS
@@ -6,7 +6,7 @@
 vars = {
   'extra_gyp_flag': '-Dextra_gyp_flag=0',
   'chromium_git': 'https://chromium.googlesource.com',
-  'chromium_revision': 'd47c24259da7aa49d2c26a6c3aa5b813a9aa53ac',
+  'chromium_revision': 'df4218dc9d43e1c2d75765122a6418348a93326f',
 }
 
 # NOTE: Prefer revision numbers to tags for svn deps. Use http rather than