Rename is_chromeos in chrome/src.

crypto/BUILD.gn

Index: crypto/BUILD.gn
diff --git a/crypto/BUILD.gn b/crypto/BUILD.gn
index 6f2adf517a9c5c87441f667dcf3ed37935e13d95..ee61a683fddb160f80488c782597d186d527db59 100644
--- a/crypto/BUILD.gn
+++ b/crypto/BUILD.gn
@@ -2,6 +2,7 @@
 # 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/crypto.gni")
 import("//testing/test.gni")
 
@@ -322,7 +323,7 @@ source_set("test_support") {
     ]
   }
 
-  if (!is_chromeos) {
+  if (!use_cros_fe) {
     sources -= [
       "scoped_test_nss_chromeos_user.cc",
       "scoped_test_nss_chromeos_user.h",