Move printing defines to buildflag system.

chrome/common/url_constants.cc

Index: chrome/common/url_constants.cc
diff --git a/chrome/common/url_constants.cc b/chrome/common/url_constants.cc
index b0c83ae582930a9dc57bd99f99e7caa60cc9db15..70680aa119aff4c7a9f2f331f96552ecca304805 100644
--- a/chrome/common/url_constants.cc
+++ b/chrome/common/url_constants.cc
@@ -10,6 +10,7 @@
 #include "build/build_config.h"
 #include "chrome/common/features.h"
 #include "content/public/common/url_constants.h"
+#include "printing/features/features.h"
 #include "url/url_util.h"
 
 namespace chrome {
@@ -264,7 +265,7 @@ const char kChromeUIWelcomeHost[] = "welcome";
 const char kChromeUIWelcomeWin10Host[] = "welcome-win10";
 const char kChromeUIWorkersHost[] = "workers";
 
-#if defined(ENABLE_PRINT_PREVIEW)
+#if BUILDFLAG(ENABLE_PRINT_PREVIEW)
 const char kChromeUIPrintHost[] = "print";
 #endif  // ENABLE_PRINT_PREVIEW
 
@@ -711,7 +712,7 @@ const char* const kChromeHostURLs[] = {
 #if defined(ENABLE_EXTENSIONS)
   kChromeUIExtensionsHost,
 #endif
-#if defined(ENABLE_PRINT_PREVIEW)
+#if BUILDFLAG(ENABLE_PRINT_PREVIEW)
   kChromeUIPrintHost,
 #endif
 #if BUILDFLAG(ENABLE_SERVICE_DISCOVERY)