mash: Convert FocusCycler to wm common types and move to //ash/common

ash/shell.cc

Index: ash/shell.cc
diff --git a/ash/shell.cc b/ash/shell.cc
index 9d15218621caed7de0e2b2a5fbb747e93603d93b..f01d2298192c2c9ddd66c406df383bfa5b319592 100644
--- a/ash/shell.cc
+++ b/ash/shell.cc
@@ -39,7 +39,6 @@
 #include "ash/display/window_tree_host_manager.h"
 #include "ash/drag_drop/drag_drop_controller.h"
 #include "ash/first_run/first_run_helper_impl.h"
-#include "ash/focus_cycler.h"
 #include "ash/frame/custom_frame_view_ash.h"
 #include "ash/gpu_support.h"
 #include "ash/high_contrast/high_contrast_controller.h"
@@ -367,11 +366,6 @@ views::NonClientFrameView* Shell::CreateDefaultNonClientFrameView(
   return new CustomFrameViewAsh(widget);
 }
 
-void Shell::RotateFocus(Direction direction) {
-  focus_cycler_->RotateFocus(direction == FORWARD ? FocusCycler::FORWARD
-                                                  : FocusCycler::BACKWARD);
-}
-
 void Shell::SetDisplayWorkAreaInsets(Window* contains,
                                      const gfx::Insets& insets) {
   if (!window_tree_host_manager_->UpdateWorkAreaOfDisplayNearestWindow(
@@ -955,7 +949,6 @@ void Shell::Init(const ShellInitParams& init_params) {
   focus_client_.reset(focus_controller);
   activation_client_ = focus_controller;
   activation_client_->AddObserver(this);
-  focus_cycler_.reset(new FocusCycler());
 
   screen_position_controller_.reset(new ScreenPositionController);