chromeos: Remove AshTestBase::SupportsMultipleDisplays

ash/app_list/app_list_presenter_delegate_unittest.cc

Index: ash/app_list/app_list_presenter_delegate_unittest.cc
diff --git a/ash/app_list/app_list_presenter_delegate_unittest.cc b/ash/app_list/app_list_presenter_delegate_unittest.cc
index 71324aeb0ff6457e56faf483f43b1aed06d7a0cd..3844f22bbc0a86842e9f78e86f546046466fabcc 100644
--- a/ash/app_list/app_list_presenter_delegate_unittest.cc
+++ b/ash/app_list/app_list_presenter_delegate_unittest.cc
@@ -115,9 +115,6 @@ TEST_F(AppListPresenterDelegateTest, TapOutsideBubbleClosesBubble) {
 // Tests opening the app launcher on a non-primary display, then deleting the
 // display.
 TEST_F(AppListPresenterDelegateTest, NonPrimaryDisplay) {
-  if (!SupportsMultipleDisplays())
-    return;
-
   // Set up a screen with two displays (horizontally adjacent).
   UpdateDisplay("1024x768,1024x768");