Move printing defines to buildflag system.

components/BUILD.gn

Index: components/BUILD.gn
diff --git a/components/BUILD.gn b/components/BUILD.gn
index debccc773ab08d19fc6c236f9e93a6c986e9e9ea..a5914eb515868c34f42cab04a0bd768039930b22 100644
--- a/components/BUILD.gn
+++ b/components/BUILD.gn
@@ -4,6 +4,7 @@
 
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
+import("//printing/features/features.gni")
 import("//testing/test.gni")
 import("//tools/grit/repack.gni")
 
@@ -412,6 +413,7 @@ if (!is_ios) {
       "//device/geolocation",
       "//ipc:test_support",
       "//net:test_support",
+      "//printing/features",
       "//services/service_manager/public/cpp",
       "//testing/gmock",
       "//testing/gtest",