Roll chromium_revision 8a1fcdb..2b7b555 (366529:366738)

Change log: https://chromium.googlesource.com/chromium/src/+log/8a1fcdb..2b7b555
Full diff: https://chromium.googlesource.com/chromium/src/+/8a1fcdb..2b7b555

No dependencies changed.
No update to Clang.

TBR=

Review URL: https://codereview.webrtc.org/1543903003

Cr-Commit-Position: refs/heads/master@{#11116}
diff --git a/DEPS b/DEPS
index 94cc881..28d964a 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': '8a1fcdb2aa873f0fb81e937c4e97156d41351735',
+  'chromium_revision': '2b7b5550416097a10d9373bc5f0810201d5f127d',
 }
 
 # NOTE: Prefer revision numbers to tags for svn deps. Use http rather than