Fulfill or reject MIDIAccessPromise from MIDIAccessor

LayoutTests/webmidi/requestmidiaccess-expected.txt

Index: LayoutTests/webmidi/requestmidiaccess-expected.txt
diff --git a/LayoutTests/webmidi/requestmidiaccess-expected.txt b/LayoutTests/webmidi/requestmidiaccess-expected.txt
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+Tests navigator.requestMIDIAccess.
+
+On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
+
+
+PASS requestMIDIAccess() succeeded with access [object MIDIAccess].
+PASS access.inputs().length is 1
+PASS access.outputs().length is 1
+PASS input attributes are correct
+PASS output attributes are correct
+PASS requestMIDIAccess() was correctly blocked for System Exclusive access with error [object DOMError].
+PASS navigator.requestMIDIAccess() did not throw exception.
+PASS navigator.requestMIDIAccess() did not throw exception.
+PASS successfullyParsed is true
+
+TEST COMPLETE
+