ash/wm: Remove dead code.

ash/shell.cc

Index: ash/shell.cc
diff --git a/ash/shell.cc b/ash/shell.cc
index 5d4e0c2529d9bf84e89ef347d633da7acb665c0c..53cff3d13e9ce7d3d71e9f5fe14369fcfe5adce0 100644
--- a/ash/shell.cc
+++ b/ash/shell.cc
@@ -11,7 +11,6 @@
 #include "ash/accelerators/accelerator_controller.h"
 #include "ash/accelerators/accelerator_delegate.h"
 #include "ash/accelerators/focus_manager_factory.h"
-#include "ash/accelerators/nested_accelerator_delegate.h"
 #include "ash/ash_switches.h"
 #include "ash/autoclick/autoclick_controller.h"
 #include "ash/desktop_background/desktop_background_controller.h"
@@ -109,7 +108,6 @@
 #include "ui/wm/core/accelerator_filter.h"
 #include "ui/wm/core/compound_event_filter.h"
 #include "ui/wm/core/focus_controller.h"
-#include "ui/wm/core/nested_accelerator_controller.h"
 #include "ui/wm/core/shadow_controller.h"
 #include "ui/wm/core/visibility_controller.h"
 #include "ui/wm/core/window_modality_controller.h"
@@ -784,7 +782,6 @@ Shell::~Shell() {
   partial_magnification_controller_.reset();
   tooltip_controller_.reset();
   event_client_.reset();
-  nested_accelerator_controller_.reset();
   toplevel_window_event_handler_.reset();
   visibility_controller_.reset();
   // |shelf_item_delegate_manager_| observes |shelf_model_|. It must be
@@ -922,8 +919,6 @@ void Shell::Init(const ShellInitParams& init_params) {
 
   cursor_manager_.SetDisplay(gfx::Screen::GetScreen()->GetPrimaryDisplay());
 
-  nested_accelerator_controller_.reset(
-      new ::wm::NestedAcceleratorController(new NestedAcceleratorDelegate));
   accelerator_controller_.reset(new AcceleratorController);
   maximize_mode_controller_.reset(new MaximizeModeController());
 
@@ -1131,11 +1126,6 @@ void Shell::InitRootWindow(aura::Window* root_window) {
       toplevel_window_event_handler_.get());
   root_window->AddPreTargetHandler(toplevel_window_event_handler_.get());
   root_window->AddPostTargetHandler(toplevel_window_event_handler_.get());
-
-  if (nested_accelerator_controller_) {
-    aura::client::SetDispatcherClient(root_window,
-                                      nested_accelerator_controller_.get());
-  }
 }
 
 bool Shell::CanWindowReceiveEvents(aura::Window* window) {