Remove myself from CSS Grid Layout watchlist

Change-Id: Ia331513429e916a5092b18cb6c6653fbb1fcc1bc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2748576
Reviewed-by: Javier Fernandez <jfernandez@igalia.com>
Commit-Queue: Manuel Rego <rego@igalia.com>
Cr-Commit-Position: refs/heads/master@{#861540}

WATCHLISTS

@@ -2230,7 +2230,6 @@
     'blink_css_fragmentation_tests': ['mstensho@chromium.org'],
     'blink_css_grid_layout': ['jfernandez@igalia.com',
                               'obrufau@igalia.com',
-                              'rego@igalia.com',
                               'svillar@igalia.com'],
     'blink_custom_elements': ['dominicc+watchlist@chromium.org'],
     'blink_device_orientation': ['juncai+watch@chromium.org',