GN: Fix extra escaping of rpath=$ORIGIN/lib ldflag

GN: Fix extra escaping of rpath=$ORIGIN/lib ldflag

As written the argument ended up in the .ninja file as \\\$$ORIGIN/lib/
but we want \$$ORIGIN/lib/ to match gyp.

R=brettw@chromium.org

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=284888

[brettw, 2014-07-23 04:17:55]

Ah! This broke when I added proper escaping. Thanks for tracking it down. LGTM

[jamesr, 2014-07-23 04:20:47]

The CQ bit was checked by jamesr@chromium.org

[jamesr, 2014-07-23 04:21:13]

On 2014/07/23 04:17:55, brettw wrote:
> Ah! This broke when I added proper escaping. Thanks for tracking it down. LGTM

Thanks!  This is what was breaking the libffmpegsumo.so lookup in some unit test
targets.

[commit-bot: I haz the power, 2014-07-23 04:23:14]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/jamesr@chromium.org/409883009/1

[commit-bot: I haz the power, 2014-07-23 05:58:52]

FYI, CQ is re-trying this CL (attempt #1).
The failing builders are:
  mac_gpu_retina_triggered_tests on tryserver.chromium.gpu
(http://build.chromium.org/p/tryserver.chromium.gpu/builders/mac_gpu_retina_tr...)

[commit-bot: I haz the power, 2014-07-23 08:57:31]

Change committed as 284888