Roll chromium_revision c511263..4bf3678 (352322:352512)

Change log: https://chromium.googlesource.com/chromium/src/+log/c511263..4bf3678
Full diff: https://chromium.googlesource.com/chromium/src/+/c511263..4bf3678

Changed dependencies:
* src/buildtools: https://chromium.googlesource.com/chromium/buildtools.git/+log/0c88009..5fc8d39
DEPS diff: https://chromium.googlesource.com/chromium/src/+/c511263..4bf3678/DEPS

No update to Clang.

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

Review URL: https://codereview.webrtc.org/1384823003

Cr-Commit-Position: refs/heads/master@{#10177}
diff --git a/DEPS b/DEPS
index 5e1f506..3165c18 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': 'c511263253e1e84a07339f19e18cd1cefd4d70a6',
+  'chromium_revision': '4bf367866625c012d1cc21da3010d4b0fb24b2eb',
 }
 
 # NOTE: Prefer revision numbers to tags for svn deps. Use http rather than