Auto merge of #15735 - servo:cssparserup, r=emilio

Update cssparser to 0.11

<!-- Please describe your changes on the following line: -->

<s>Depends on https://github.com/servo/rust-cssparser/pull/122.</s>

---
<!-- Thank you for contributing to Servo! Please replace each `[ ]` by `[X]` when the step is complete, and replace `__` with appropriate data: -->
- [x] `./mach build -d` does not report any errors
- [x] `./mach test-tidy` does not report any errors
- [ ] These changes fix #__ (github issue number if applicable).

<!-- Either: -->
- [ ] There are tests for these changes OR
- [ ] These changes do not require tests because _____

<!-- Pull requests that do not address these steps are welcome, but they will require additional verification as part of the review process. -->

<!-- Reviewable:start -->
---
This change is [<img src="https://reviewable.io/review_button.svg" height="34" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/servo/servo/15735)
<!-- Reviewable:end -->

tests/unit/style/Cargo.toml

@@ -14,7 +14,7 @@ testing = ["style/testing"]
 
 [dependencies]
 app_units = "0.4"
-cssparser = {version = "0.10", features = ["heapsize"]}
+cssparser = {version = "0.11", features = ["heapsize"]}
 euclid = "0.11"
 html5ever-atoms = "0.2"
 matches = "0.1"

tests/unit/style/str.rs

@@ -3,7 +3,7 @@
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 use std::borrow::Cow;
-use style::str::{split_html_space_chars, str_join, cow_into_ascii_lowercase};
+use style::str::{split_html_space_chars, str_join};
 
 #[test]
 pub fn split_html_space_chars_whitespace() {
@@ -34,13 +34,3 @@ pub fn test_str_join_many() {
     let expected = "-alpha--beta-gamma-";
     assert_eq!(actual, expected);
 }
-
-#[test]
-pub fn test_cow_into_ascii_lowercase() {
-    assert!(matches!(cow_into_ascii_lowercase("abc.d"), Cow::Borrowed("abc.d")));
-    let string = String::from("abc.d");
-    assert!(matches!(cow_into_ascii_lowercase(string), Cow::Owned(ref s) if s == "abc.d"));
-    assert!(matches!(cow_into_ascii_lowercase("Abc.d"), Cow::Owned(ref s) if s == "abc.d"));
-    assert!(matches!(cow_into_ascii_lowercase("aBC.D"), Cow::Owned(ref s) if s == "abc.d"));
-    assert!(matches!(cow_into_ascii_lowercase("abc.D"), Cow::Owned(ref s) if s == "abc.d"));
-}

tests/unit/stylo/Cargo.toml

@@ -14,7 +14,7 @@ doctest = false
 [dependencies]
 app_units = "0.4"
 atomic_refcell = "0.1"
-cssparser = "0.10"
+cssparser = "0.11"
 env_logger = "0.4"
 euclid = "0.11"
 lazy_static = "0.2"