Roll chromium_revision 234bb451a0..c6596482a6 (439579:439640)

Change log: https://chromium.googlesource.com/chromium/src/+log/234bb451a0..c6596482a6
Full diff: https://chromium.googlesource.com/chromium/src/+/234bb451a0..c6596482a6

Changed dependencies:
* src/third_party/catapult: https://chromium.googlesource.com/external/github.com/catapult-project/catapult.git/+log/7ca359550f..d77eaf7f69
DEPS diff: https://chromium.googlesource.com/chromium/src/+/234bb451a0..c6596482a6/DEPS

No update to Clang.

TBR=
BUG=None

Review-Url: https://codereview.webrtc.org/2592553002
Cr-Commit-Position: refs/heads/master@{#15693}
diff --git a/DEPS b/DEPS
index 75a0161..a9f65b8 100644
--- a/DEPS
+++ b/DEPS
@@ -5,7 +5,7 @@
 
 vars = {
   'chromium_git': 'https://chromium.googlesource.com',
-  'chromium_revision': '234bb451a006c60823f0ade952cde5232683cd2d',
+  'chromium_revision': 'c6596482a643b73b8cfe7b615639e6fea449e08b',
 }
 
 deps = {