Move printing defines to buildflag system.

components/resources/BUILD.gn

Index: components/resources/BUILD.gn
diff --git a/components/resources/BUILD.gn b/components/resources/BUILD.gn
index 93d9f9ae0f584943603b60a04d74b2c6a92a44c8..4384ea21b7306cdd910c8d835e4224313eb51760 100644
--- a/components/resources/BUILD.gn
+++ b/components/resources/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("//printing/features/features.gni")
 import("//tools/grit/grit_rule.gni")
 import("//third_party/brotli/brotli.gni")
 
@@ -30,6 +31,7 @@ grit("components_resources") {
     "-E",
     "about_credits_file=" + rebase_path(about_credits_file_bro, root_build_dir),
   ]
+  defines = [ "enable_print_preview=$enable_print_preview" ]
 
   deps = [
     ":compressed_about_credits",