GN bootstrap fixes:

build/config/features.gni

Index: build/config/features.gni
diff --git a/build/config/features.gni b/build/config/features.gni
index 0f639bed1830219b8e3f45fab92a71883078f574..8a87814ec9ad16d97f14540edc30719e1fd56b4b 100644
--- a/build/config/features.gni
+++ b/build/config/features.gni
@@ -115,6 +115,8 @@ declare_args() {
   # specified in testing/variations/fieldtrial_testing_config_*.json.
   # Note: this setting is ignored if is_chrome_branded.
   fieldtrial_testing_like_official_build = is_chrome_branded
+
+  use_cups = (is_desktop_linux || is_mac) && !is_chromecast

[tfarina, 2015/11/04 15:04:31]

was this required for the bootstrap fixes? If not, I would suggest doing it in a
separate CL.

[Paweł Hajdan Jr., 2015/11/04 16:55:54]

Yes, this makes bootstrap possible in an environment where cups is unavailable.

 }
 
 # Additional dependent variables -----------------------------------------------
@@ -166,8 +168,6 @@ enable_extensions = !is_android && !is_ios
 
 enable_task_manager = !is_ios && !is_android
 
-use_cups = (is_desktop_linux || is_mac) && !is_chromecast
-
 enable_themes = !is_android && !is_ios
 
 # TODO(scottmg) remove this when we've fixed printing.