Skip mulitple-dispay tests on win8

ash/wm/activation_controller_unittest.cc

Index: ash/wm/activation_controller_unittest.cc
diff --git a/ash/wm/activation_controller_unittest.cc b/ash/wm/activation_controller_unittest.cc
index 33f6a078e00d5a85707fa350a2b423edf6a1fc5d..74ad9b85351f8b33270b9bf9d117068823a07683 100644
--- a/ash/wm/activation_controller_unittest.cc
+++ b/ash/wm/activation_controller_unittest.cc
@@ -533,18 +533,12 @@ TEST_F(ActivationControllerTest, ActivateLockScreen) {
   EXPECT_TRUE(w1->HasFocus());
 }
 
-#if defined(OS_WIN)
-// Multiple displays are not supported on Windows Ash. http://crbug.com/165962
-#define MAYBE_NextActiveWindowOnMultipleDisplays \
-        DISABLED_NextActiveWindowOnMultipleDisplays
-#else
-#define MAYBE_NextActiveWindowOnMultipleDisplays \
-        NextActiveWindowOnMultipleDisplays
-#endif
-
 // Verifies that a next active window is chosen from current
 // active display.
-TEST_F(ActivationControllerTest, MAYBE_NextActiveWindowOnMultipleDisplays) {
+TEST_F(ActivationControllerTest, NextActiveWindowOnMultipleDisplays) {
+  if (!SupportsMultipleDisplays())
+    return;
+
   UpdateDisplay("300x300,300x300");
   Shell::RootWindowList root_windows = Shell::GetAllRootWindows();