ash: Resize PowerButtonController background layer.

ash/shell.cc

Index: ash/shell.cc
diff --git a/ash/shell.cc b/ash/shell.cc
index 3aab8a54b33008cac7312bdc8d7b4f9e86039edb..d025e4d17520b803eaaeef575dae7852f1f8d76f 100644
--- a/ash/shell.cc
+++ b/ash/shell.cc
@@ -574,14 +574,15 @@ Shell::~Shell() {
   // Alphabetical.
   activation_controller_.reset();
   drag_drop_controller_.reset();
+  event_client_.reset();
   magnification_controller_.reset();
+  monitor_controller_.reset();
+  power_button_controller_.reset();
   resize_shadow_controller_.reset();
   screen_dimmer_.reset();
   shadow_controller_.reset();
-  window_cycle_controller_.reset();
-  event_client_.reset();
-  monitor_controller_.reset();
   tooltip_controller_.reset();
+  window_cycle_controller_.reset();
 
   // Launcher widget has a InputMethodBridge that references to
   // input_method_filter_'s input_method_. So explicitly release launcher_