style: Use write_char in place of write_str when serializing single-character literals

Generated by running

  find servo/components/style -name "*.rs" -exec perl -p -i -e "s/write_str\(\"(.)\"\)/write_char('\1')/g" {} \;

(and then added `use std::fmt::Write;` in a couple of places to fix build errors that arose).

Differential Revision: https://phabricator.services.mozilla.com/D168217

2 files changed, 3 insertions, 3 deletions

diff --git a/components/style/servo/selector_parser.rs b/components/style/servo/selector_parser.rs
index 901ef71071e..08431dba684 100644
--- a/components/style/servo/selector_parser.rs
+++ b/components/style/servo/selector_parser.rs
@@ -337,7 +337,7 @@ impl ToCss for NonTSPseudoClass {
         if let Lang(ref lang) = *self {
             dest.write_str(":lang(")?;
             serialize_identifier(lang, dest)?;
-            return dest.write_str(")");
+            return dest.write_char(')');
         }
 
         dest.write_str(match *self {
diff --git a/components/style/servo/url.rs b/components/style/servo/url.rs
index f4ae4e25edf..2186be7aabd 100644
--- a/components/style/servo/url.rs
+++ b/components/style/servo/url.rs
@@ -158,7 +158,7 @@ impl ToCss for CssUrl {
 
         dest.write_str("url(")?;
         string.to_css(dest)?;
-        dest.write_str(")")
+        dest.write_char(')')
     }
 }
 
@@ -230,7 +230,7 @@ impl ToCss for ComputedUrl {
 
         dest.write_str("url(")?;
         string.to_css(dest)?;
-        dest.write_str(")")
+        dest.write_char(')')
     }
 }