Fix typo pointed out by Alexander L. Slovesnik <als@mozilla.ru>. b=187007

dom/locales/en-US/chrome/layout/css.properties

@@ -124,6 +124,6 @@ PEEndOfDeclEOF=end of declaration
 PEImportantEOF=important
 PEExpectedImportant=Expected 'important' but found '%1$S'.
 PEBadDeclEnd=Expected ';' to terminate declaration but found '%1$S'.
-PEBadDeclOrRuleEnd=Expected ';' or '}' to terminate declaration but found"))
+PEBadDeclOrRuleEnd=Expected ';' or '}' to terminate declaration but found '%1$S'.
 PEInaccessibleProperty=Attempt to use inaccessible property
 PECommentEOF=end of comment