Disabling extended desktop (by default).

ash/root_window_controller_unittest.cc

Index: ash/root_window_controller_unittest.cc
diff --git a/ash/root_window_controller_unittest.cc b/ash/root_window_controller_unittest.cc
index 12b27e82b419d272393630c50dc5d7b4eb02bb0c..1f50afd54fe06fc5e147fae055e9e032a8cdb9b8 100644
--- a/ash/root_window_controller_unittest.cc
+++ b/ash/root_window_controller_unittest.cc
@@ -61,8 +61,24 @@ aura::Window* GetModalContainer(aura::RootWindow* root_window) {
 }  // namespace
 
 namespace test {
+class RootWindowControllerTest : public test::AshTestBase {
+ public:
+  RootWindowControllerTest() {}
+  virtual ~RootWindowControllerTest() {}
+
+  virtual void SetUp() OVERRIDE {
+    internal::DisplayController::SetExtendedDesktopEnabled(true);
+    AshTestBase::SetUp();
+  }
 
-typedef test::AshTestBase RootWindowControllerTest;
+  virtual void TearDown() OVERRIDE {
+    AshTestBase::TearDown();
+    internal::DisplayController::SetExtendedDesktopEnabled(false);
+  }
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(RootWindowControllerTest);
+};
 
 TEST_F(RootWindowControllerTest, MoveWindows_Basic) {
   UpdateDisplay("600x600,500x500");