Rename is_chromeos in chrome/src.

device/bluetooth/BUILD.gn

Index: device/bluetooth/BUILD.gn
diff --git a/device/bluetooth/BUILD.gn b/device/bluetooth/BUILD.gn
index 03bf6c2ce3450a5706a3deecddbeb2b42c7cddb7..9a0e9b5efa82ca10bac781db93309cbe821cdda9 100644
--- a/device/bluetooth/BUILD.gn
+++ b/device/bluetooth/BUILD.gn
@@ -2,6 +2,8 @@
 # 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")
+
 if (is_android) {
   import("//build/config/android/rules.gni")  # For generate_jni().
 }
@@ -142,7 +144,7 @@ component("bluetooth") {
     deps += [ ":jni_headers" ]
   }
 
-  if (is_chromeos) {
+  if (use_cros_fe) {
     deps += [
       "//chromeos",
       "//dbus",