Roll chromium_revision 5a2ae99..4a38519 (359027:359080)

Change log: https://chromium.googlesource.com/chromium/src/+log/5a2ae99..4a38519
Full diff: https://chromium.googlesource.com/chromium/src/+/5a2ae99..4a38519

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/1433253002

Cr-Commit-Position: refs/heads/master@{#10600}
diff --git a/DEPS b/DEPS
index 5fd6b24..4d574d3 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': '5a2ae99953738eaefe9ddb813289e0eafc598200',
+  'chromium_revision': '4a38519c4653ed87bf438e00a059bbb6291b110b',
 }
 
 # NOTE: Prefer revision numbers to tags for svn deps. Use http rather than