IDL: overload resolution for array or sequence types

Straightforward.

4 interfaces:
IDBDatabase
IDBObjectStore
MIDIOutput
Navigator

(Doc/comment fixes to the IDL files.)

R=haraken
BUG=293561

Review URL: https://codereview.chromium.org/289623002

git-svn-id: svn://svn.chromium.org/blink/trunk@174027 bbb929c8-8fbe-4397-9dbb-9b2b20218538