chromeos: Remove AshTestBase::SupportsMultipleDisplays

ash/wm/dock/docked_window_layout_manager_unittest.cc

Index: ash/wm/dock/docked_window_layout_manager_unittest.cc
diff --git a/ash/wm/dock/docked_window_layout_manager_unittest.cc b/ash/wm/dock/docked_window_layout_manager_unittest.cc
index d3c24f9c189d436a9e941b473849781847609e5c..6fcd020ff895647b37cf6eac69c06a3aaa19e38d 100644
--- a/ash/wm/dock/docked_window_layout_manager_unittest.cc
+++ b/ash/wm/dock/docked_window_layout_manager_unittest.cc
@@ -323,9 +323,6 @@ TEST_P(DockedWindowLayoutManagerTest, AutoPlacingRight) {
 // RearrangeVisibleWindowOnShow places windows flush with work area edges.
 // Test case for the secondary screen.
 TEST_P(DockedWindowLayoutManagerTest, AutoPlacingRightSecondScreen) {
-  if (!SupportsMultipleDisplays())
-    return;
-
   // Create a dual screen layout.
   UpdateDisplay("600x600,600x600");
 
@@ -499,9 +496,6 @@ TEST_P(DockedWindowLayoutManagerTest, ThreeWindowsDragging) {
 
 // Adds three windows in bottom display and tests layout after a drag.
 TEST_P(DockedWindowLayoutManagerTest, ThreeWindowsDraggingSecondScreen) {
-  if (!SupportsMultipleDisplays())
-    return;
-
   // Create two screen vertical layout.
   UpdateDisplay("600x1000,600x1000");
   // Layout the secondary display to the bottom of the primary.
@@ -776,9 +770,6 @@ TEST_P(DockedWindowLayoutManagerTest, TwoWindowsHeightRestrictions) {
 // Tests that a docked window is moved to primary display when secondary display
 // is disconnected and that it stays docked and properly positioned.
 TEST_P(DockedWindowLayoutManagerTest, DisplayDisconnectionMovesDocked) {
-  if (!SupportsMultipleDisplays())
-    return;
-
   // Create a dual screen layout.
   UpdateDisplay("600x700,800x600");