Moves Shell::maximize_mode_controller() to WmShell

ash/common/wm_shell.cc

Index: ash/common/wm_shell.cc
diff --git a/ash/common/wm_shell.cc b/ash/common/wm_shell.cc
index 99bda5c96f60c5b26e3e26131026ecf744bc0a84..bab48cce697e7237b8977401a9b6de60aae3dc6a 100644
--- a/ash/common/wm_shell.cc
+++ b/ash/common/wm_shell.cc
@@ -10,6 +10,7 @@
 #include "ash/common/system/chromeos/session/logout_confirmation_controller.h"
 #include "ash/common/system/tray/system_tray_delegate.h"
 #include "ash/common/system/tray/system_tray_notifier.h"
+#include "ash/common/wm/maximize_mode/maximize_mode_controller.h"
 #include "ash/common/wm/mru_window_tracker.h"
 #include "ash/common/wm/overview/window_selector_controller.h"
 #include "ash/common/wm_window.h"
@@ -113,6 +114,14 @@ void WmShell::DeleteWindowSelectorController() {
   window_selector_controller_.reset();
 }
 
+void WmShell::CreateMaximizeModeController() {
+  maximize_mode_controller_.reset(new MaximizeModeController);
+}
+
+void WmShell::DeleteMaximizeModeController() {
+  maximize_mode_controller_.reset();
+}
+
 void WmShell::CreateMruWindowTracker() {
   mru_window_tracker_.reset(new MruWindowTracker);
 }