Ensure that we don't allow 'normal' alongside other values in content property

third_party/WebKit/LayoutTests/css-parser/content-parsing.html

Index: third_party/WebKit/LayoutTests/css-parser/content-parsing.html
diff --git a/third_party/WebKit/LayoutTests/css-parser/content-parsing.html b/third_party/WebKit/LayoutTests/css-parser/content-parsing.html
index 9c4bcdf76bbb02b8937c8ace9e7ef44913a3207a..120e377a5776360a4480587c344fa5afaaa3065a 100644
--- a/third_party/WebKit/LayoutTests/css-parser/content-parsing.html
+++ b/third_party/WebKit/LayoutTests/css-parser/content-parsing.html
@@ -5,6 +5,16 @@
 <script>
 assert_valid_value("content", '"a"');
 assert_valid_value("content", "open-quote");
+assert_valid_value("content", "normal");
+assert_valid_value("content", 'url("test.html")');
+
+assert_invalid_value("content", 'normal normal');
+assert_invalid_value("content", 'normal "a"');
+assert_invalid_value("content", 'normal url("test.html")');
+assert_invalid_value("content", "normal open-quote");
+assert_invalid_value("content", '"a" normal');
+assert_invalid_value("content", 'url("test.html") normal');
+assert_invalid_value("content", "'open-quote' normal");
 assert_invalid_value("content", "not valid content");
 assert_invalid_value("content", "open-quote invalid content");
 assert_invalid_value("content", '"a" still not valid');