[code-inclusion] Rename first-letter-property-whitelist.html

Also changes some text in this test as well.

Bug: 1097225
Change-Id: I3dc128dee8d5f35d30509af38291183297ffc535
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2254824
Commit-Queue: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#780476}

third_party/blink/web_tests/fast/css/first-letter-property-whitelist.html → third_party/blink/web_tests/fast/css/first-letter-property.html

@@ -42,11 +42,11 @@ function testFirstLetterProperty(property, rule, expected, reason) {
 
 for (var property in validProperties) {
   testFirstLetterProperty(property, validProperties[property], validProperties[property],
-                          "Whitelisted property " + property + " should be applied to first-letter pseudo elements.");
+                          "Valid property " + property + " should be applied to first-letter pseudo elements.");
 }
 
 for (var property in invalidProperties) {
   testFirstLetterProperty(property, invalidProperties[property], defaultComputedStyle[property],
-                          "Non-whitelisted property " + property + " should not be applied to first-letter pseudo elements.");
+                          "Invalid property " + property + " should not be applied to first-letter pseudo elements.");
 }
 </script>