Use newer CSS variable names for ESR 140
See bugzilla bug 1861521, which is tracking some of the CSS renames.
Some relevant for us:
-
--in-content-icon-colorto--icon-color. -
--in-content-warning-icon-colorto--icon-color-warning. -
--in-content-success-icon-colorto--icon-color-success. -
--in-content-box-backgroundto--box-background-color. -
--in-content-accent-colorto--color-accent-primary. -
--in-content-accent-color-activeto--color-accent-primary-active. -
--in-content-focus-outline-offsetto--focus-outline-offset. Optional since the original token still exits. -
--button-bgcolorto--button-background-color. Only used for the security level background in the security level popup. Maybe should be replaced with a non-button variable.