Remove --ash-disable-overview-mode

ash/focus_cycler.cc

Index: ash/focus_cycler.cc
diff --git a/ash/focus_cycler.cc b/ash/focus_cycler.cc
index c83db87b134cdc2a3f335f6caae00cf525172064..eea4aed6cd439f74c668c58f7ae68faa82afe37e 100644
--- a/ash/focus_cycler.cc
+++ b/ash/focus_cycler.cc
@@ -6,7 +6,7 @@
 
 #include "ash/shell.h"
 #include "ash/wm/mru_window_tracker.h"
-#include "ash/wm/window_cycle_controller.h"
+#include "ash/wm/window_state.h"
 #include "ash/wm/window_util.h"
 #include "ui/aura/client/activation_client.h"
 #include "ui/aura/window.h"
@@ -77,13 +77,12 @@ void FocusCycler::RotateFocus(Direction direction) {
 
     if (index == browser_index) {
       // Activate the most recently active browser window.
-      ash::Shell::GetInstance()->window_cycle_controller()->HandleCycleWindow(
-          WindowCycleController::FORWARD, false);
-
-      // Rotate pane focus within that window.
-      aura::Window* window = ash::wm::GetActiveWindow();
-      if (!window)
+      MruWindowTracker::WindowList mru_windows(
+          Shell::GetInstance()->mru_window_tracker()->BuildMruWindowList());
+      if (mru_windows.empty())
         break;
+      aura::Window* window(mru_windows[mru_windows.size() > 1 ? 1 : 0]);
+      wm::GetWindowState(window)->Activate();
       views::Widget* widget = views::Widget::GetWidgetForNativeWindow(window);
       if (!widget)
         break;