Bug 1769832: Move a print-related #include to an ifdef-guarded section, to fix compile error with --disable-printing. r=jwatt

Differential Revision: https://phabricator.services.mozilla.com/D146627

dom/ipc/BrowserChild.cpp

@@ -36,7 +36,6 @@
 #include "mozilla/EventListenerManager.h"
 #include "mozilla/HoldDropJSObjects.h"
 #include "mozilla/IMEStateManager.h"
-#include "mozilla/layout/RemotePrintJobChild.h"
 #include "mozilla/LookAndFeel.h"
 #include "mozilla/MouseEvents.h"
 #include "mozilla/NativeKeyBindingsType.h"
@@ -148,6 +147,7 @@
 #endif
 
 #ifdef NS_PRINTING
+#  include "mozilla/layout/RemotePrintJobChild.h"
 #  include "nsIPrintSettings.h"
 #  include "nsIPrintSettingsService.h"
 #  include "nsIWebBrowserPrint.h"