GN: Add -Wl,-z defs on linux and fix errors

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")
 
 declare_args() {
   # Use the PCI lib to collect GPU information on Linux.
   use_libpci = true
 }
@@ skipping 66 matching lines @@
     defines += [ "USE_LIBPCI=1" ]
   }
   if (is_linux && use_libpci && (use_x11 || use_ozone)) {
     deps += [ "//build/config/linux:libpci" ]
   }
   if (is_linux && use_x11) {
     configs += [
       "//build/config/linux:x11",
       "//build/config/linux:xext",
     ]
-    deps += [ "//third_party/libXNVCtrl" ]
+    deps += [
+      "//third_party/libXNVCtrl",
+      "//ui/gfx/x/",

[Nico, 2015/01/15 23:35:07]

no trailing / (?)

[jamesr, 2015/01/16 02:00:45]

Done.

+    ]
   } else {
     sources -= [ "gpu_info_collector_x11.cc" ]
   }
   if (!use_ozone) {
     sources -= [ "gpu_info_collector_ozone.cc" ]
   }
 }