chaps: Migrate libchromeos to its own ebuild

All platform2 packages should have their own ebuild that will be compiled
independently. Packages should DEPEND on libchromeos and should not have a gyp
dependency on libchromeos's gyp file anymore.

BUG=chromium:381372
TEST=emerge-daisy libchromeos && emerge-daisy platform2 work
TEST=trybot run on daisy, link, mario and duck.
TEST=trybot run on lumpy-incremental-paladin.

CQ-DEPEND=CL:202748

Change-Id: I404b80bd6a358f0a403bc7d827c5a4e1d8e9ce61
Reviewed-on: https://chromium-review.googlesource.com/202761
Tested-by: Bertrand Simonnet <bsimonnet@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Commit-Queue: Bertrand Simonnet <bsimonnet@chromium.org>
diff --git a/chaps.gyp b/chaps.gyp
index 09cdca4..ed2815f 100644
--- a/chaps.gyp
+++ b/chaps.gyp
@@ -3,15 +3,13 @@
     'build_chaps_live_tests': 0,
   },
   'target_defaults': {
-    'dependencies': [
-      '../../platform2/libchromeos/libchromeos-<(libbase_ver).gyp:libchromeos-<(libbase_ver)',
-    ],
     'variables': {
       'deps': [
         'dbus-c++-1',
         'protobuf-lite',
         'openssl',
         'libchrome-<(libbase_ver)',
+        'libchromeos-<(libbase_ver)',
       ],
     },
   },