Make webkit_compositor_support depend directly on WebKit.gyp:webkit

Make webkit_compositor_support depend directly on WebKit.gyp:webkit

This is necessary to pick up a direct_dependent_settings in the chromium_code=0
case (i.e. a WebKit checkout with chromium deps) so includes of the form:
#include "third_party/WebKit/..." work as expected

BUG=

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=154974

[Peter Beverloo, 2012-09-05 16:34:00]

LGTM, but you'll need owners too (though a TBR should be fine).

You seem to only have a partial description for the change, there may be an
example missing. Could you amend that?

[jamesr, 2012-09-05 16:46:08]

On 2012/09/05 16:34:00, Peter Beverloo wrote:
> LGTM, but you'll need owners too (though a TBR should be fine).
> 
> You seem to only have a partial description for the change, there may be an
> example missing. Could you amend that?

Thanks, leading a line with # is sadness apparently.

I'm owners here

[jamesr, 2012-09-05 16:48:01]

Will land soon as mac/win come back - they look good so far but I've been bitten
by really weird component issues a lot lately so I want to be sure before
inflicting this upon everyone.