Roll chromium_revision 8b35b05724..9d5d9721db (409830:409966)

Change log: https://chromium.googlesource.com/chromium/src/+log/8b35b05724..9d5d9721db
Full diff: https://chromium.googlesource.com/chromium/src/+/8b35b05724..9d5d9721db

Changed dependencies:
* src/buildtools: https://chromium.googlesource.com/chromium/buildtools.git/+log/88c6fc5bde..9c6ad6f5cb
DEPS diff: https://chromium.googlesource.com/chromium/src/+/8b35b05724..9d5d9721db/DEPS

No update to Clang.

TBR=

Review-Url: https://codereview.webrtc.org/2214363002
Cr-Commit-Position: refs/heads/master@{#13650}
diff --git a/DEPS b/DEPS
index 3af2303..8ac477a 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': '8b35b0572443f4a84377a1fbd199a1edabe3d7d6',
+  'chromium_revision': '9d5d9721db94c90e362f857be02b5f0de22a5219',
 }
 
 # NOTE: Use http rather than https; the latter can cause problems for users