Add chrome_elf and cloud_print to "gn check"

cloud_print/virtual_driver/win/port_monitor/BUILD.gn

Index: cloud_print/virtual_driver/win/port_monitor/BUILD.gn
diff --git a/cloud_print/virtual_driver/win/port_monitor/BUILD.gn b/cloud_print/virtual_driver/win/port_monitor/BUILD.gn
index bda788b155320931183e65a12c6df64f9379b2c6..7107258925140da725b2e7120f7f2b66fcb743fd 100644
--- a/cloud_print/virtual_driver/win/port_monitor/BUILD.gn
+++ b/cloud_print/virtual_driver/win/port_monitor/BUILD.gn
@@ -51,6 +51,8 @@ shared_library("port_monitor_dll") {
     "//base",
     "//chrome/common:constants",
     "//chrome/common:version_header",
+    "//cloud_print/common",
+    "//cloud_print/virtual_driver/win",
   ]
 
   libs = [ "userenv.lib" ]
@@ -66,6 +68,7 @@ source_set("lib") {
     "//base",
     "//chrome/common:constants",
     "//chrome/installer/launcher_support",
+    "//cloud_print/common",
     "//cloud_print/virtual_driver/win",
   ]
 }