Remove oak windows and its flags.

ash/accelerators/accelerator_controller.cc

Index: ash/accelerators/accelerator_controller.cc
diff --git a/ash/accelerators/accelerator_controller.cc b/ash/accelerators/accelerator_controller.cc
index b7a51cfb50a6a5ea6b9fa8f107c11f879a592fe9..f89a4aa19f8b98a76fe3aa28acf3d6fc5eefff66 100644
--- a/ash/accelerators/accelerator_controller.cc
+++ b/ash/accelerators/accelerator_controller.cc
@@ -67,7 +67,6 @@
 #include "ui/events/event.h"
 #include "ui/events/keycodes/keyboard_codes.h"
 #include "ui/gfx/screen.h"
-#include "ui/oak/oak.h"
 #include "ui/views/controls/webview/webview.h"
 #include "ui/views/debug_utils.h"
 #include "ui/views/widget/widget.h"
@@ -455,15 +454,6 @@ void HandleShowMessageCenterBubble() {
   }
 }
 
-bool HandleShowOak() {
-  if (CommandLine::ForCurrentProcess()->HasSwitch(
-        switches::kAshEnableOak)) {
-    oak::ShowOakWindowWithContext(Shell::GetPrimaryRootWindow());
-    return true;
-  }
-  return false;
-}
-
 bool HandleShowSystemTrayBubble() {
   base::RecordAction(UserMetricsAction("Accel_Show_System_Tray_Bubble"));
   internal::RootWindowController* controller =
@@ -1039,8 +1029,6 @@ bool AcceleratorController::PerformAction(int action,
       return HandleRotatePaneFocus(Shell::BACKWARD);
     case SHOW_KEYBOARD_OVERLAY:
       return HandleShowKeyboardOverlay();
-    case SHOW_OAK:
-      return HandleShowOak();
     case SHOW_SYSTEM_TRAY_BUBBLE:
       return HandleShowSystemTrayBubble();
     case SHOW_MESSAGE_CENTER_BUBBLE: