Roll chromium_revision 2a1b03e..6ebca7d (352576:352640)

Change log: https://chromium.googlesource.com/chromium/src/+log/2a1b03e..6ebca7d
Full diff: https://chromium.googlesource.com/chromium/src/+/2a1b03e..6ebca7d

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/1393453003

Cr-Commit-Position: refs/heads/master@{#10187}
diff --git a/DEPS b/DEPS
index 4f7d922..2473431 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': '2a1b03ebb89a061babaa85bc88dbecab8081db34',
+  'chromium_revision': '6ebca7dc190c49473fd35de1f3ccd02ab829c8c4',
 }
 
 # NOTE: Prefer revision numbers to tags for svn deps. Use http rather than