power save blocker: Don't try to block power saving in headless mode

device/power_save_blocker/BUILD.gn

 # Copyright 2016 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/features.gni")
 import("//build/config/ui.gni")
 
 if (is_android) {
   import("//build/config/android/rules.gni")
 }
@@ skipping 17 matching lines @@
 
   if (use_dbus) {
     deps += [ "//dbus" ]
   }
 
   if (use_x11) {
     configs += [ "//build/config/linux:x11" ]
     if (!is_chromeos) {
       configs += [ "//build/config/linux:xscrnsaver" ]
     }
-    deps += [ "//ui/gfx/x" ]
+    deps += [
+      "//ui/gfx",
+      "//ui/gfx/x",
+    ]
   }
 
   # Dealing with power_save_blocker_{x11,ozone}.cc is a little complicated
   # given the interaction between os_chromeos and the feature flags for X11 and
   # ozone, so do it all in one spot.
   if (is_chromeos || !use_ozone) {
     sources -= [ "power_save_blocker_ozone.cc" ]
   }
   if (is_chromeos || !use_x11 || !use_dbus) {
     sources -= [ "power_save_blocker_x11.cc" ]
@@ skipping 30 matching lines @@
   }
 
   android_library("java") {
     java_files = java_sources_needing_jni
     deps = [
       "//base:base_java",
       "//ui/android:ui_java",
     ]
   }
 }