Remove Node.isSupported

Remove Node.isSupported

Intent to Deprecate and Remove:
https://groups.google.com/a/chromium.org/d/msg/blink-dev/MUEjC37jFNg/hf1AHFl-4jsJ

There were many old W3C tests for isSupported, which were all removed.
These indirectly tested DOMImplementation.hasFeature, but there are many
direct tests for that which should suffice.

BUG=334970
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=165237

[eseidel, 2014-01-16 17:44:48]

lgtm

We used to have some sort of half-policy in webkit.org of not modifyhing the
imported w3c tests.  I suspect that ship has sailed.  I'm OK deleting these
ancien tests.

[commit-bot: I haz the power, 2014-01-16 17:44:54]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/philipj@opera.com/133703014/1

[commit-bot: I haz the power, 2014-01-16 17:51:48]

Change committed as 165237

[Dirk Pranke, 2014-01-16 19:19:42]

On 2014/01/16 17:51:48, I haz the power (commit-bot) wrote:
> Change committed as 165237

I suspect a lot of the dom/ tests should be deleted in favor of the w3c's
current equivalents.