Roll chromium_revision 55b9604..c670faf (367087:367136)

Change log: https://chromium.googlesource.com/chromium/src/+log/55b9604..c670faf
Full diff: https://chromium.googlesource.com/chromium/src/+/55b9604..c670faf

No dependencies changed.
No update to Clang.

TBR=

Review URL: https://codereview.webrtc.org/1550383003

Cr-Commit-Position: refs/heads/master@{#11140}
diff --git a/DEPS b/DEPS
index 96f98f8..4a8167c 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': '55b9604451329b9bb95aefa567236a5a056e5d47',
+  'chromium_revision': 'c670faf42a716a6e1d66086b450612bf693aba14',
 }
 
 # NOTE: Prefer revision numbers to tags for svn deps. Use http rather than