Roll chromium_revision 3b8be21..9dfb3a1 (363445:363718)

Change log: https://chromium.googlesource.com/chromium/src/+log/3b8be21..9dfb3a1
Full diff: https://chromium.googlesource.com/chromium/src/+/3b8be21..9dfb3a1

Changed dependencies:
* src/tools/gyp: https://chromium.googlesource.com/external/gyp.git/+log/e2313c0..70ee80e
DEPS diff: https://chromium.googlesource.com/chromium/src/+/3b8be21..9dfb3a1/DEPS

No update to Clang.

TBR=

Review URL: https://codereview.webrtc.org/1507643003

Cr-Commit-Position: refs/heads/master@{#10924}
diff --git a/DEPS b/DEPS
index d76d870..5855382 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': '3b8be2124e3f1d3ce09d534315fb9a8f50ead086',
+  'chromium_revision': '9dfb3a1532325291acce215f86ef7a4b8f242a7d',
 }
 
 # NOTE: Prefer revision numbers to tags for svn deps. Use http rather than