Roll chromium_revision 0bf3ae4..40d9ba6 (357288:357298)

Change log: https://chromium.googlesource.com/chromium/src/+log/0bf3ae4..40d9ba6
Full diff: https://chromium.googlesource.com/chromium/src/+/0bf3ae4..40d9ba6

No dependencies changed.
No update to Clang.

TBR=
CQ_EXTRA_TRYBOTS=tryserver.webrtc:win_baremetal,mac_baremetal,linux_baremetal

Review URL: https://codereview.webrtc.org/1406003004

Cr-Commit-Position: refs/heads/master@{#10474}
diff --git a/DEPS b/DEPS
index abe04ab..349e529 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': '0bf3ae453e2c4bb9ba0f5e78a7f82847d55f2d5a',
+  'chromium_revision': '40d9ba69acc929515cd23196022edfd4b49ed9a0',
 }
 
 # NOTE: Prefer revision numbers to tags for svn deps. Use http rather than