Enabling Extended Deskop by default.

ash/display/display_controller.cc

Index: ash/display/display_controller.cc
diff --git a/ash/display/display_controller.cc b/ash/display/display_controller.cc
index c50c4b9a6d0af5313c0fba2af6b5fd241bfd4bcb..456b831235a36e971c5e3bb6e08f7ee21f7567a8 100644
--- a/ash/display/display_controller.cc
+++ b/ash/display/display_controller.cc
@@ -22,10 +22,6 @@
 
 namespace ash {
 namespace internal {
-namespace {
-// True if the extended desktop mode is enabled.
-bool extended_desktop_enabled = false;
-}  // namespace
 
 DisplayController::DisplayController()
     : secondary_display_layout_(RIGHT),
@@ -211,14 +207,10 @@ void DisplayController::OnDisplayRemoved(const gfx::Display& display) {
 
 // static
 bool DisplayController::IsExtendedDesktopEnabled(){
-  return extended_desktop_enabled ||
+  static bool extended_desktop_disabled =
       CommandLine::ForCurrentProcess()->HasSwitch(
-          switches::kAshExtendedDesktop);
-}
-
-// static
-void DisplayController::SetExtendedDesktopEnabled(bool enabled) {
-  extended_desktop_enabled = enabled;
+          switches::kAshExtendedDesktopDisabled);
+  return !extended_desktop_disabled;
 }
 
 aura::RootWindow* DisplayController::AddRootWindowForDisplay(