MIDI{Input, Output}Map[Symbol.iterator]() should return entries.

LayoutTests/webmidi/requestmidiaccess-expected.txt

 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.sysexEnabled is defined.
 PASS access.sysexEnabled is false
 PASS access.inputs.size is 1
+PASS access.outputs.size is 1
+for (var input of inputs.values())
 PASS input.id is "MockInputID"
 PASS input.manufacturer is "MockInputManufacturer"
 PASS input.name is "MockInputName"
 PASS input.version is "MockInputVersion"
+for (var input of inputs.keys())
 PASS inputKey is "MockInputID"
+for (var input of inputs.entries())
 PASS entry[0] is inputKey
 PASS entry[1] is input
-PASS inputValue is input
+for (var input of inputs)
+PASS entry[0] is inputKey
+PASS entry[1] is input
 PASS inputs.has('MockInputID') is true
 PASS inputs.has('MockOutputID') is false
 PASS inputs.get('MockInputID') is input
 PASS inputs.get('MockOutputID') is undefined.
+for (var output of outputs.values())
 PASS output.id is "MockOutputID"
 PASS output.manufacturer is "MockOutputManufacturer"
 PASS output.name is "MockOutputName"
 PASS output.version is "MockOutputVersion"
+for (var output of outputs.keys())
 PASS outputKey is "MockOutputID"
+for (var output of outputs.entries())
 PASS entry[0] is outputKey
 PASS entry[1] is output
-PASS outputValue is output
+for (var output of outputs)
+PASS entry[0] is outputKey
+PASS entry[1] is output
 PASS outputs.has('MockOutputID') is true
 PASS outputs.has('MockInputID') is false
 PASS outputs.get('MockOutputID') is output
 PASS outputs.get('MockInputID') is undefined.
 PASS a note on message is sent without timestamp
 PASS a note on message is sent with timestamp
 PASS output.send([0xfff, 0x45, 0x7f]) threw exception TypeError: Failed to execute 'send' on 'MIDIOutput': The value at index 0 (4095) is greater than 0xFF..
 PASS output.send([0xf0, 0x45, 0xf7]) threw exception InvalidAccessError: Failed to execute 'send' on 'MIDIOutput': System exclusive message is not allowed at index 0 (240)..
 PASS requestMIDIAccess() was correctly blocked for System Exclusive access with error [object DOMError].
 PASS successfullyParsed is true
 
 TEST COMPLETE