Remove Linux ChromiumOS GN build configs from //testing/buildbot.

testing/buildbot/gn_isolate_map.pyl

Index: testing/buildbot/gn_isolate_map.pyl
diff --git a/testing/buildbot/gn_isolate_map.pyl b/testing/buildbot/gn_isolate_map.pyl
index e91db24c8796ac6e6747f539e30dd8e06c80d88e..7800e8da2a1944c679a5fbd6d35ba518a987ad0c 100644
--- a/testing/buildbot/gn_isolate_map.pyl
+++ b/testing/buildbot/gn_isolate_map.pyl
@@ -462,10 +462,6 @@
     "type": "raw",
     "args": [],
   },
-  "gn_all": {
-    "label": "//:gn_all",
-    "type": "additional_compile_target",
-  },
   "gn_unittests": {

[dnj, 2016/09/23 17:37:09]

Is this still relevant?

[Dirk Pranke, 2016/09/23 17:42:02]

Assuming you're asking about gn_unittests and not gn_all, yes, it's definitely
still relevant; this binary runs the tests for GN itself.

gn_all is still a legal build target, but none of the builders are currently
specifying it so it doesn't need to be in this file.

[dnj, 2016/09/23 17:54:00]

Acknowledged.

     "label": "//tools/gn:gn_unittests",
     "type": "raw",