mash: Move shelf menu code to //ash/common/shelf

ash/ash.gyp

Index: ash/ash.gyp
diff --git a/ash/ash.gyp b/ash/ash.gyp
index b1362c3bcaf31d511cf751995dad3f08e66d6fc6..bd3ef60116f477ea7da280354770476df82f4d0b 100644
--- a/ash/ash.gyp
+++ b/ash/ash.gyp
@@ -73,6 +73,8 @@
       'common/session/session_state_observer.cc',
       'common/session/session_state_observer.h',
       'common/session/session_types.h',
+      'common/shelf/shelf_alignment_menu.cc',
+      'common/shelf/shelf_alignment_menu.h',
       'common/shelf/shelf_constants.cc',
       'common/shelf/shelf_constants.h',
       'common/shelf/shelf_item_delegate.h',
@@ -80,6 +82,7 @@
       'common/shelf/shelf_item_delegate_manager.h',
       'common/shelf/shelf_item_types.cc',
       'common/shelf/shelf_item_types.h',
+      'common/shelf/shelf_menu_model.h',
       'common/shelf/shelf_model.cc',
       'common/shelf/shelf_model.h',
       'common/shelf/shelf_model_observer.h',
@@ -360,8 +363,6 @@
       'shelf/scoped_observer_with_duplicated_sources.h',
       'shelf/shelf.cc',
       'shelf/shelf.h',
-      'shelf/shelf_alignment_menu.cc',
-      'shelf/shelf_alignment_menu.h',
       'shelf/shelf_bezel_event_filter.cc',
       'shelf/shelf_bezel_event_filter.h',
       'shelf/shelf_button.cc',
@@ -375,7 +376,6 @@
       'shelf/shelf_layout_manager_observer.h',
       'shelf/shelf_locking_manager.cc',
       'shelf/shelf_locking_manager.h',
-      'shelf/shelf_menu_model.h',
       'shelf/shelf_navigator.cc',
       'shelf/shelf_navigator.h',
       'shelf/shelf_tooltip_manager.cc',