gn fixes for ui/gl and mac

gpu/config/BUILD.gn

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build/config/ui.gni")
 
 source_set("config") {
   sources = [
     "dx_diag_node.cc",
     "dx_diag_node.h",
@@ skipping 46 matching lines @@
   }
   if (is_linux && use_x11) {
     configs += [
       "//build/config/linux:x11",
       "//build/config/linux:xext",
     ]
     deps += [
       "//build/config/linux:libpci",
       "//third_party/libXNVCtrl",
     ]
+  } else {
+    sources -= [ "gpu_info_collector_x11.cc" ]
   }
 }