Remove support for the heapsize crate

Author: SimonSapin

Cargo.toml

@@ -22,7 +22,6 @@ encoding_rs = "0.8"
 [dependencies]
 cssparser-macros = {path = "./macros", version = "0.5"}
 dtoa-short = "0.3"
-heapsize = {version = ">= 0.3, < 0.5", optional = true}
 itoa = "0.4"
 matches = "0.1"
 phf = {version = "0.8", features = ["macros"]}

src/color.rs

@@ -101,9 +101,6 @@ impl<'de> Deserialize<'de> for RGBA {
     }
 }
 
-#[cfg(feature = "heapsize")]
-known_heap_size!(0, RGBA);
-
 impl ToCss for RGBA {
     fn to_css<W>(&self, dest: &mut W) -> fmt::Result
     where
@@ -141,9 +138,6 @@ pub enum Color {
     RGBA(RGBA),
 }
 
-#[cfg(feature = "heapsize")]
-known_heap_size!(0, Color);
-
 impl ToCss for Color {
     fn to_css<W>(&self, dest: &mut W) -> fmt::Result
     where

src/serializer.rs

@@ -402,9 +402,6 @@ impl_tocss_for_float!(f64);
 #[derive(Copy, Clone, Eq, PartialEq, Debug)]
 pub struct TokenSerializationType(TokenSerializationTypeVariants);
 
-#[cfg(feature = "heapsize")]
-known_heap_size!(0, TokenSerializationType);
-
 impl TokenSerializationType {
     /// Return a value that represents the absence of a token, e.g. before the start of the input.
     pub fn nothing() -> TokenSerializationType {