Bug 1649644 [wpt PR 24405] - Update wpt metadata, a=testonly

wpt-pr: 24405
wpt-type: metadata

testing/web-platform/meta/html/semantics/embedded-content/media-elements/historical.html.ini

@@ -0,0 +1,7 @@
+[historical.html]
+  [video.mozPreservesPitch should not be supported]
+    expected: FAIL
+
+  [audio.mozPreservesPitch should not be supported]
+    expected: FAIL
+

testing/web-platform/meta/html/semantics/embedded-content/media-elements/preserves-pitch.html.ini

@@ -0,0 +1,10 @@
+[preserves-pitch.html]
+  [Slow-downs should change the pitch when preservesPitch=false]
+    expected: FAIL
+
+  [Speed-ups should change the pitch when preservesPitch=false]
+    expected: FAIL
+
+  [Test that preservesPitch is present and unprefixed.]
+    expected: FAIL
+