Add sysexEnabled readonly attribute to MIDIAccess

Source/modules/webmidi/MIDIInput.cpp

Index: Source/modules/webmidi/MIDIInput.cpp
diff --git a/Source/modules/webmidi/MIDIInput.cpp b/Source/modules/webmidi/MIDIInput.cpp
index efd14fdca91b61ffb1f725e07c7ec9fafa960fda..42054e87fc06136a2519497db9d46959bbe9eece 100644
--- a/Source/modules/webmidi/MIDIInput.cpp
+++ b/Source/modules/webmidi/MIDIInput.cpp
@@ -57,10 +57,10 @@ void MIDIInput::didReceiveMIDIData(unsigned portIndex, const unsigned char* data
     if (!length)
         return;
 
-    // Drop SysEx message here when the client does not request it. Note that this is not a security check but an
-    // automatic filtering for clients that do not want SysEx message. Also note that SysEx message will never be sent
-    // unless the current process has an explicit permission to handle SysEx message.
-    if (data[0] == 0xf0 && !midiAccess()->sysExEnabled())
+    // Drop sysex message here when the client does not request it. Note that this is not a security check but an
+    // automatic filtering for clients that do not want sysex message. Also note that sysex message will never be sent
+    // unless the current process has an explicit permission to handle sysex message.
+    if (data[0] == 0xf0 && !midiAccess()->sysexEnabled())
         return;
     RefPtr<Uint8Array> array = Uint8Array::create(data, length);
     dispatchEvent(MIDIMessageEvent::create(timeStamp, array));