Relevant commits appear to be https://chromium.googlesource.com/chromium/src/+/dac98ec90b237d6786e2a508d1e74a2d4012ff33 and https://chromium.googlesource.com/chromium/src/+/8a2bcc815371466a141910a09f7d844c00a09887, but they haven't been backported to the 61 branch, as far as I can tell.
Relevant commits appear to be https:/ /chromium. googlesource. com/chromium/ src/+/dac98ec90 b237d6786e2a508 d1e74a2d4012ff3 3 and https:/ /chromium. googlesource. com/chromium/ src/+/8a2bcc815 371466a141910a0 9f7d844c00a0988 7, but they haven't been backported to the 61 branch, as far as I can tell.