Refactor webkit resources targets.

Refactor webkit resources targets.

* First, this was to remove blink_common_resources target that was moved
* into third_party/WebKit/public:resources.

* Second, the above clean up reduced webkit/BUILD.gn into a single
* target that could be moved closer to webkit_resources.grd, becoming
* webkit/glue/resources/BUILD.gn and //webkit/glue/resources target,
* which is much more inline with the GN philosophy.

BUG=400860
TEST=gn gen out/Debug_gn && ninja -C out/Debug_gn
R=brettw@chromium.org
TBR=ben@chromium.org

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=289163

[tfarina, 2014-08-12 02:55:10]

Brett, ping?

[brettw, 2014-08-12 21:35:52]

lgtm

[tfarina, 2014-08-12 22:18:59]

TBRing Ben for this...(since it is just GN changes, which Brett's review cover
it).

[tfarina, 2014-08-12 22:19:59]

The CQ bit was checked by tfarina@chromium.org

[commit-bot: I haz the power, 2014-08-12 22:30:09]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/tfarina@chromium.org/458053002/1

[commit-bot: I haz the power, 2014-08-13 02:54:51]

Change committed as 289163