style: Make -moz-border-colors chrome only.

This also makes the `border` shorthand not reset them.

Bug: 1417200
Reviewed-by: xidorn
MozReview-Commit-ID: KNais1e5FnE

components/style/properties/longhand/border.mako.rs

@@ -74,6 +74,7 @@ ${helpers.gecko_keyword_conversion(Keyword('border-style',
                        spec="Nonstandard (https://developer.mozilla.org/en-US/docs/Web/CSS/-moz-border-*-colors)"
                        products="gecko"
                        flags="APPLIES_TO_FIRST_LETTER"
+                       enabled_in="chrome"
                        ignored_when_colors_disabled="True">
         use std::fmt;
         use style_traits::ToCss;

components/style/properties/shorthand/border.mako.rs

@@ -131,16 +131,9 @@ pub fn parse_border<'i, 't>(context: &ParserContext, input: &mut Parser<'i, 't>)
         for side in PHYSICAL_SIDES
         for prop in ['color', 'style', 'width'])}
         ${' '.join('border-image-%s' % name
-        for name in ['outset', 'repeat', 'slice', 'source', 'width'])}
-        ${' '.join('-moz-border-%s-colors' % side
-        for side in PHYSICAL_SIDES) if product == 'gecko' else ''}"
+        for name in ['outset', 'repeat', 'slice', 'source', 'width'])}"
     spec="https://drafts.csswg.org/css-backgrounds/#border">
 
-    % if product == "gecko":
-        use properties::longhands::{_moz_border_top_colors, _moz_border_right_colors,
-                                    _moz_border_bottom_colors, _moz_border_left_colors};
-    % endif
-
     pub fn parse_value<'i, 't>(context: &ParserContext, input: &mut Parser<'i, 't>)
                                -> Result<Longhands, ParseError<'i>> {
         use properties::longhands::{border_image_outset, border_image_repeat, border_image_slice};
@@ -152,9 +145,6 @@ pub fn parse_border<'i, 't>(context: &ParserContext, input: &mut Parser<'i, 't>)
                 border_${side}_color: color.clone(),
                 border_${side}_style: style,
                 border_${side}_width: width.clone(),
-                % if product == "gecko":
-                    _moz_border_${side}_colors: _moz_border_${side}_colors::get_initial_specified_value(),
-                % endif
             % endfor
 
             // The ‘border’ shorthand resets ‘border-image’ to its initial value.