Refactor AccelerometerReader to provide an Observer

ash/shell.cc

Index: ash/shell.cc
diff --git a/ash/shell.cc b/ash/shell.cc
index 1f7b015a50a0cec91aed1487a4667d3ae2004ce4..3038e77c8f690aa997b4b53b33f893f7edd019c5 100644
--- a/ash/shell.cc
+++ b/ash/shell.cc
@@ -11,7 +11,6 @@
 #include "ash/accelerators/accelerator_delegate.h"
 #include "ash/accelerators/focus_manager_factory.h"
 #include "ash/accelerators/nested_accelerator_delegate.h"
-#include "ash/accelerometer/accelerometer_controller.h"
 #include "ash/ash_switches.h"
 #include "ash/autoclick/autoclick_controller.h"
 #include "ash/desktop_background/desktop_background_controller.h"
@@ -139,6 +138,7 @@
 #include "ash/virtual_keyboard_controller.h"
 #include "base/bind_helpers.h"
 #include "base/sys_info.h"
+#include "chromeos/accelerometer/accelerometer_reader.h"
 #include "chromeos/dbus/dbus_thread_manager.h"
 #include "ui/chromeos/user_activity_power_manager_notifier.h"
 #include "ui/display/chromeos/display_configurator.h"
@@ -638,13 +638,13 @@ Shell::Shell(ShellDelegate* delegate)
       delegate_(delegate),
       window_positioner_(new WindowPositioner),
       activation_client_(NULL),
-      accelerometer_controller_(new AccelerometerController()),
 #if defined(OS_CHROMEOS)
+      accelerometer_reader_(new chromeos::AccelerometerReader()),
       display_configurator_(new ui::DisplayConfigurator()),
 #endif  // defined(OS_CHROMEOS)
       native_cursor_manager_(new AshNativeCursorManager),
       cursor_manager_(
-          scoped_ptr< ::wm::NativeCursorManager>(native_cursor_manager_)),
+          scoped_ptr<::wm::NativeCursorManager>(native_cursor_manager_)),
       simulate_modal_window_open_for_testing_(false),
       is_touch_hud_projection_enabled_(false) {
   DCHECK(delegate_.get());