godofredoc 720cd0baaa Prepare scripts for the master to main migration. (flutter/engine#29371)
It changes master branch with main to prepare for the migration.
This change will be landed in synchronization with changes to modify
 the engine default branch to main.

Bug: https://github.com/flutter/flutter/issues/90476
2021-11-15 09:06:11 -08:00
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