Roll chromium_revision 7f405ec2b6..4b42aa218b (411933:411951)

Change log: https://chromium.googlesource.com/chromium/src/+log/7f405ec2b6..4b42aa218b
Full diff: https://chromium.googlesource.com/chromium/src/+/7f405ec2b6..4b42aa218b

No dependencies changed.
No update to Clang.

TBR=

Review-Url: https://codereview.webrtc.org/2247703002
Cr-Commit-Position: refs/heads/master@{#13745}
diff --git a/DEPS b/DEPS
index b764ac0..90c205b 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': '7f405ec2b6914d482d081d2cb5d80bdf5226bd57',
+  'chromium_revision': '4b42aa218b8ebeef9ef8eef3109df7d89214d38d',
 }
 
 # NOTE: Use http rather than https; the latter can cause problems for users