Move printing defines to buildflag system.

chrome/test/BUILD.gn

Index: chrome/test/BUILD.gn
diff --git a/chrome/test/BUILD.gn b/chrome/test/BUILD.gn
index 655153009a85888b6d7bb471900def773f5f6022..dbf6b8ca2fce19ec7ca2a82f75ae53579bbe47d3 100644
--- a/chrome/test/BUILD.gn
+++ b/chrome/test/BUILD.gn
@@ -123,6 +123,7 @@ static_library("test_support") {
     "//content/test:test_support",
     "//net",
     "//net:test_support",
+    "//printing/features",
     "//skia",
     "//sql",
     "//sql:test_support",
@@ -1227,6 +1228,7 @@ test("browser_tests") {
     ":test_support",
     "//base",
     "//components/sync:test_support_model",
+    "//printing/features",
     "//third_party/WebKit/public:features",
   ]