Oilpan: Make WebSocketChannel GarbageCollectedFinalized
Oilpan: Make WebSocketChannel GarbageCollectedFinalized

Now that WebSocketChannel::ref/deref is gone, WebSocketChannel doesn't need to be
RefCountedGarbageCollected. This CL changes WebSocketChannel to
GarbageCollectedFinalized.

BUG=497595

Review URL: https://codereview.chromium.org/1163273002

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@196651 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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