chromeos: Remove AshTestBase::SupportsMultipleDisplays

ash/wm/maximize_mode/maximize_mode_controller_unittest.cc

Index: ash/wm/maximize_mode/maximize_mode_controller_unittest.cc
diff --git a/ash/wm/maximize_mode/maximize_mode_controller_unittest.cc b/ash/wm/maximize_mode/maximize_mode_controller_unittest.cc
index 18f000d3229f59ed5ea38d72c9b9cde4f77a5efa..616917d182bca0d30fabbe4e172d9974d0e98273 100644
--- a/ash/wm/maximize_mode/maximize_mode_controller_unittest.cc
+++ b/ash/wm/maximize_mode/maximize_mode_controller_unittest.cc
@@ -466,9 +466,6 @@ TEST_F(MaximizeModeControllerTest,
 
 // Test if this case does not crash. See http://crbug.com/462806
 TEST_F(MaximizeModeControllerTest, DisplayDisconnectionDuringOverview) {
-  if (!SupportsMultipleDisplays())
-    return;
-
   UpdateDisplay("800x600,800x600");
   std::unique_ptr<aura::Window> w1(
       CreateTestWindowInShellWithBounds(gfx::Rect(0, 0, 100, 100)));