Bug 829383 follow-up: make the test only run in per-window private browsing builds

docshell/test/chrome/Makefile.in

@@ -94,11 +94,16 @@ MOCHITEST_CHROME_FILES =	\
 		test_mozFrameType.xul \
 		mozFrameType_window.xul \
 		test_bug789773.xul \
-		test_private_hidden_window.html \
     docshell_helpers.js \
     generic.html \
     $(NULL)
 
+ifdef MOZ_PER_WINDOW_PRIVATE_BROWSING
+MOCHITEST_CHROME_FILES += \
+		test_private_hidden_window.html \
+		$(NULL)
+endif
+
 ifneq ($(MOZ_WIDGET_TOOLKIT),gtk2)
 MOCHITEST_CHROME_FILES += \
 		test_bug454235.xul \