Update brave to 0.61.51
Full changelog can be found here.
This update also contains the update to Chrome 73 which brings in a lot of security fixes.
Test Plan: - Browsed a couple websites and checked version string in about page
Reviewers: Triage Team, JoshStrobl
Reviewed By: Triage Team, JoshStrobl
Differential Revision: https://dev.getsol.us/D5725