style: Unprefix -moz-fit-content

I'm not aware of any reason we shouldn't do this, as it is interoperable
with other browsers, and it causes compat issues from sites that forget
to use the prefixed version.

Note this removes some #[parse(aliases)]. These only affect devtools
autocomplete behavior, and we avoid autocompleting -moz-prefixed
keywords when possible, so even though it's a slight behavior change,
it's worth it.

Differential Revision: https://phabricator.services.mozilla.com/D126718

components/style/values/computed/length.rs

@@ -189,7 +189,7 @@ impl Size {
             #[cfg(feature = "gecko")]
             GenericSize::MinContent |
             GenericSize::MaxContent |
-            GenericSize::MozFitContent |
+            GenericSize::FitContent |
             GenericSize::MozAvailable |
             GenericSize::FitContentFunction(_) => false
         }

components/style/values/generics/length.rs

@@ -157,7 +157,7 @@ pub enum GenericSize<LengthPercent> {
     MinContent,
     #[cfg(feature = "gecko")]
     #[animation(error)]
-    MozFitContent,
+    FitContent,
     #[cfg(feature = "gecko")]
     #[animation(error)]
     MozAvailable,
@@ -207,15 +207,13 @@ pub enum GenericMaxSize<LengthPercent> {
     None,
     #[cfg(feature = "gecko")]
     #[animation(error)]
-    #[parse(aliases = "-moz-max-content")]
     MaxContent,
     #[cfg(feature = "gecko")]
     #[animation(error)]
-    #[parse(aliases = "-moz-min-content")]
     MinContent,
     #[cfg(feature = "gecko")]
     #[animation(error)]
-    MozFitContent,
+    FitContent,
     #[cfg(feature = "gecko")]
     #[animation(error)]
     MozAvailable,

components/style/values/specified/length.rs

@@ -1235,7 +1235,7 @@ macro_rules! parse_size_non_length {
                 #[cfg(feature = "gecko")]
                 "max-content" | "-moz-max-content" => $size::MaxContent,
                 #[cfg(feature = "gecko")]
-                "-moz-fit-content" => $size::MozFitContent,
+                "fit-content" | "-moz-fit-content" => $size::FitContent,
                 #[cfg(feature = "gecko")]
                 "-moz-available" => $size::MozAvailable,
                 $auto_or_none => $size::$auto_or_none_ident,