Renamed enable_printing and printing_mode in *.gyp* and .*gn* files.

build/config/BUILD.gn

Index: build/config/BUILD.gn
diff --git a/build/config/BUILD.gn b/build/config/BUILD.gn
index 3f3506b7bd4acba871e6c36b17acaea95875cc0e..ecbef88c790ef5fe76e10a917cce264e50da34c6 100644
--- a/build/config/BUILD.gn
+++ b/build/config/BUILD.gn
@@ -54,9 +54,16 @@ config("feature_flags") {
   if (enable_plugins) {
     defines += [ "ENABLE_PLUGINS=1" ]
   }
-  if (printing_mode > 0) {
-    defines += [ "ENABLE_PRINTING=1",  "ENABLE_BASIC_PRINTING=1" ]
-    if (printing_mode < 2) {
+  if (enable_basic_printing || enable_print_preview) {
+    # Convenience define for ENABLE_BASIC_PRINTING || ENABLE_PRINT_PREVIEW.
+    defines += [ "ENABLE_PRINTING=1" ]
+    if (enable_basic_printing) {
+      # Enable basic printing support and UI.
+      defines += [ "ENABLE_BASIC_PRINTING=1" ]
+    }
+    if (enable_print_preview) {
+      # Enable printing with print preview.
+      # Can be defined without ENABLE_BASIC_PRINTING.
       defines += [ "ENABLE_PRINT_PREVIEW=1" ]
     }
   }