This update includes 1 security fix. 

[$TBD][1067851] Critical CVE-2020-6457: Use after free in speech recognizer.
Reported by Leecraso and Guang Gong of Alpha Lab, Qihoo 360 on 2020-04-04
We would also like to thank all security researchers that worked with us during
the development cycle to prevent security bugs from ever reaching the stable
channel.
Many of our security bugs are detected using AddressSanitizer, MemorySanitizer,
UndefinedBehaviorSanitizer, Control Flow Integrity, libFuzzer, or AFL.
Prudhvikumar Bommana Google Chrome
Share on Twitter Share on Facebook

https://chromereleases.googleblog.com/2020/04/stable-channel-update-for-desktop_15.html