test: remove reference to whatwg in file names under test/wpt

WPT covers standards in both W3C and WHATWG, as such it would be
strange to make this disparity explicit in our file names
(e.g. when testing standards that are solely in W3C, like
performance-timeline). Remove the reference to WHATWG will
also make the file names shorter.

PR-URL: #24826
Refs: #24823
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Daijiro Wachi <daijiro.wachi@gmail.com>

Author: joyeecheung

test/wpt/README.md

@@ -40,7 +40,7 @@ $ git node wpt url
 
 ### 3. Create the test driver
 
-For example, for the URL tests, add a file `test/wpt/test-whatwg-url.js`:
+For example, for the URL tests, add a file `test/wpt/test-url.js`:
 
 ```js
 'use strict';
@@ -75,14 +75,14 @@ Run the test using `tools/test.py` and see if there are any failures.
 For example, to run all the URL tests under `test/fixtures/wpt/url`:
 
 ```text
-$ tools/test.py wpt/test-whatwg-url
+$ tools/test.py wpt/test-url
 ```
 
 To run a specific test in WPT, for example, `url/url-searchparams.any.js`,
 pass the file name as argument to the corresponding test driver:
 
 ```text
-node --expose-internals test/wpt/test-whatwg-url.js url-searchparams.any.js
+node --expose-internals test/wpt/test-url.js url-searchparams.any.js
 ```
 
 If there are any failures, update the corresponding status file