buffet: stop linking against libmetrics

BUG=None
TEST=emerge-amd64-generic --unmerge metrics && emerge-amd64-generic buffet
works.

Change-Id: I45d46b0a335d0d71c8dc6f57404b887d6cfe0488
Reviewed-on: https://chromium-review.googlesource.com/214756
Reviewed-by: Alex Vakulenko <avakulenko@chromium.org>
Tested-by: Bertrand Simonnet <bsimonnet@chromium.org>
Commit-Queue: Bertrand Simonnet <bsimonnet@chromium.org>

buffet/buffet.gyp

diff --git a/buffet/buffet.gyp b/buffet/buffet.gyp
index 63fde02..f245e5e 100644
--- a/buffet/buffet.gyp
+++ b/buffet/buffet.gyp
@@ -5,7 +5,6 @@
         'dbus-1',
         'libchrome-<(libbase_ver)',
         'libchromeos-<(libbase_ver)',
-        'libmetrics-<(libbase_ver)',
       ],
     },
   },