NativeIO: Fix file cleanup in createFile() utility function.

Bug: 914488
Change-Id: Ie6e96662dda40da4cf2ec21aceae3a7978017829
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2249580
Commit-Queue: Marijn Kruisselbrink <mek@chromium.org>
Auto-Submit: Victor Costan <pwnall@chromium.org>
Reviewed-by: Marijn Kruisselbrink <mek@chromium.org>
Cr-Commit-Position: refs/heads/master@{#779480}

third_party/blink/web_tests/external/wpt/native-io/close_async.tentative.https.any.js

@@ -10,7 +10,7 @@ async function createFile(testCase, fileName) {
   const file = await nativeIO.open(fileName);
   testCase.add_cleanup(async () => {
     await file.close();
-    await nativeIO.delete('test_file');
+    await nativeIO.delete(fileName);
   });
 
   const writeSharedArrayBuffer = new SharedArrayBuffer(4);

third_party/blink/web_tests/external/wpt/native-io/close_sync.tentative.https.any.js

@@ -10,7 +10,7 @@ function createFileSync(testCase, fileName) {
   const file = nativeIO.openSync(fileName);
   testCase.add_cleanup(() => {
     file.close();
-    nativeIO.deleteSync('test_file');
+    nativeIO.deleteSync(fileName);
   });
 
   const writtenBytes = Uint8Array.from([64, 65, 66, 67]);

third_party/blink/web_tests/external/wpt/native-io/concurrent_io_async.tentative.https.any.js

@@ -10,7 +10,7 @@ async function createFile(testCase, fileName) {
   const file = await nativeIO.open(fileName);
   testCase.add_cleanup(async () => {
     await file.close();
-    await nativeIO.delete('test_file');
+    await nativeIO.delete(fileName);
   });
 
   const writeSharedArrayBuffer = new SharedArrayBuffer(4);