Browser-compat-data: Chrome & Safari CSS compat data: Flexbox & Grid

[Elchi3]

The following CSS compat data lacks real values for Chrome and/or Safari. Update the true or null values to a version number or false.

Part of #3710

• [x] css.properties.align-content.flex_context.left_right (#4476)
• [x] css.properties.align-content.flex_context.baseline (#4604)
• [x] css.properties.align-content.flex_context.first_last_baseline (#4604)
• [x] css.properties.align-content.flex_context.safe_unsafe (#4604)
• [x] css.properties.align-items.grid_context.start_end (#4604)
• [x] css.properties.align-items.flex_context.first_last_baseline (#4604)
• [x] css.properties.align-items.flex_context.start_end (#4549)
• [x] css.properties.align-items.flex_context.left_right (#4604)
• [x] css.properties.align-items.flex_context.safe_unsafe (#4604)
• [x] css.properties.align-self.flex_context (-webkit- prefix) (#4458)
• [x] css.properties.flex-basis.max-content (#4476)
• [x] css.properties.flex-basis.min-content (#4476)
• [x] css.properties.flex-wrap (-webkit- prefix) (#4458)
• [x] css.properties.grid-template-columns.repeat (#4594)
• [x] css.properties.grid-template-rows.repeat (#4594)
• [x] css.properties.justify-content.flex_context (-webkit- prefix) (#4458)
• [x] css.properties.justify-content.flex_context.start_end (#4604)
• [x] css.properties.justify-content.flex_context.left_right (#4604)
• [x] css.properties.justify-content.flex_context.baseline (#4476)
• [x] css.properties.justify-content.flex_context.first_last_baseline (#4476)
• [x] css.properties.justify-content.flex_context.stretch (#4604)
• [x] css.properties.justify-content.flex_context.safe_unsafe (#4604)
• [x] css.properties.order.absolutely_positioned_flex_children (#4613)
• [x] css.properties.place-content.flex_context (#4607)
• [x] css.properties.place-content.grid_context (#4607)
• [x] css.properties.place-content.prevent-duplicated-values (#4614)
• [x] css.properties.place-items.grid_context (#4607)
• [x] css.properties.place-items.flex_context (#4607)

[vinyldarkscratch]

🎵 Another one bites the dust 🎵

Looks like we’ve blown through all Flexbox & Grid properties, whoo!