chromeos: Remove AshTestBase::SupportsMultipleDisplays

ash/drag_drop/drag_drop_controller_unittest.cc

Index: ash/drag_drop/drag_drop_controller_unittest.cc
diff --git a/ash/drag_drop/drag_drop_controller_unittest.cc b/ash/drag_drop/drag_drop_controller_unittest.cc
index dba9ef0ca31dc9329fc7cf312251a3a38d36e671..5218187d75f75b367705b3adbb70de06a7a45344 100644
--- a/ash/drag_drop/drag_drop_controller_unittest.cc
+++ b/ash/drag_drop/drag_drop_controller_unittest.cc
@@ -936,9 +936,6 @@ class DragImageWindowObserver : public aura::WindowObserver {
 // Verifies the drag image moves back to the position where drag is started
 // across displays when drag is cancelled.
 TEST_F(DragDropControllerTest, DragCancelAcrossDisplays) {
-  if (!SupportsMultipleDisplays())
-    return;
-
   UpdateDisplay("400x400,400x400");
   aura::Window::Windows root_windows =
       Shell::GetInstance()->GetAllRootWindows();
@@ -1017,9 +1014,6 @@ TEST_F(DragDropControllerTest, DragCancelAcrossDisplays) {
 
 // Verifies that a drag is aborted if a display is disconnected during the drag.
 TEST_F(DragDropControllerTest, DragCancelOnDisplayDisconnect) {
-  if (!SupportsMultipleDisplays())
-    return;
-
   UpdateDisplay("400x400,400x400");
   for (aura::Window* root : Shell::GetInstance()->GetAllRootWindows()) {
     aura::client::SetDragDropClient(root, drag_drop_controller_.get());