Bug fix: Memory leak of VTTCue

The current implementation doesn't release a VTTCue object at V8TextTrackCue::constructorCustom. This causes a memory leak at media/track/text-track-cue-constructor.html of the layout tests.

Review URL: https://codereview.chromium.org/99703005

git-svn-id: svn://svn.chromium.org/blink/trunk@163951 bbb929c8-8fbe-4397-9dbb-9b2b20218538
IDL compiler: [ActiveDOMObject, NamedConstructor]

BUG=239771
NOTRY=true

Review URL: https://codereview.chromium.org/116203002

git-svn-id: svn://svn.chromium.org/blink/trunk@163952 bbb929c8-8fbe-4397-9dbb-9b2b20218538
DevTools: [JsDocValidator] Make sure messages are always sorted in the output

Messages were sorted in the order of node post-visits, which occurs inside-out,
so for double-nested functions the message order was reversed.

R=aandrey, eustas, sergeyv, vsevik

Review URL: https://codereview.chromium.org/103753005

git-svn-id: svn://svn.chromium.org/blink/trunk@163953 bbb929c8-8fbe-4397-9dbb-9b2b20218538