Rename is_chromeos in chrome/src.

content/browser/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/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//content/browser/browser.gni")
 import("//media/media_options.gni")
 
@@ skipping 291 matching lines @@
   }
 
   if (use_x11) {
     configs += [ "//build/config/linux:x11" ]
     deps += [ "//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) {
+  if (use_cros_fe || !use_ozone) {
     sources -= [ "power_save_blocker_ozone.cc" ]
   }
-  if (is_chromeos || !use_x11) {
+  if (use_cros_fe || !use_x11) {
     sources -= [ "power_save_blocker_x11.cc" ]
   }
 
   # Dealing with *wifi_data_provider_*.cc is also a bit complicated given
   # android, chromeos, linux and use_dbus.
   if (is_android) {
     sources -= [ "geolocation/wifi_data_provider_common.cc" ]
   }
-  if (is_chromeos || (is_linux && !use_dbus)) {
+  if (use_cros_fe || (is_linux && !use_dbus)) {
     sources -= [ "geolocation/wifi_data_provider_linux.cc" ]
   }
   if (is_linux && use_dbus) {
     sources -= [ "geolocation/empty_wifi_data_provider.cc" ]
   }
 
   if (use_pango) {
     configs += [ "//build/config/linux:pangocairo" ]
   }
 
@@ skipping 54 matching lines @@
       "//third_party/mozilla",
       "//third_party/sudden_motion_sensor",
       "//ui/accelerated_widget_mac",
     ]
     libs += [
       "bsm",
       "QTKit.framework",
     ]
   }
 
-  if (is_chromeos) {
+  if (use_cros_fe) {
     sources -= [ "device_sensors/data_fetcher_shared_memory_default.cc" ]
     deps += [
       "//chromeos",
       "//chromeos:power_manager_proto",
     ]
   }
 
   if (use_aura) {
     deps += [
       "//ui/aura",
@@ skipping 89 matching lines @@
   if (enable_webvr) {
     sources += [
       "vr/vr_device.cc",
       "vr/vr_device.h",
       "vr/vr_device_manager.cc",
       "vr/vr_device_manager.h",
       "vr/vr_device_provider.h",
     ]
   }
 }