Refactors DockedWindowLayoutManager in terms of ash/wm/common

ash/shelf/shelf_alignment_menu.cc

Index: ash/shelf/shelf_alignment_menu.cc
diff --git a/ash/shelf/shelf_alignment_menu.cc b/ash/shelf/shelf_alignment_menu.cc
index f274ced1528ba9b7959c7e0093a6f401dede5a66..a46d34e0e3fbb3a984dd6df9d72091f7767c1ccc 100644
--- a/ash/shelf/shelf_alignment_menu.cc
+++ b/ash/shelf/shelf_alignment_menu.cc
@@ -52,15 +52,15 @@ void ShelfAlignmentMenu::ExecuteCommand(int command_id, int event_flags) {
   switch (static_cast<MenuItem>(command_id)) {
     case MENU_ALIGN_LEFT:
       shell->metrics()->RecordUserMetricsAction(UMA_SHELF_ALIGNMENT_SET_LEFT);
-      shelf_->SetAlignment(SHELF_ALIGNMENT_LEFT);
+      shelf_->SetAlignment(wm::SHELF_ALIGNMENT_LEFT);
       break;
     case MENU_ALIGN_BOTTOM:
       shell->metrics()->RecordUserMetricsAction(UMA_SHELF_ALIGNMENT_SET_BOTTOM);
-      shelf_->SetAlignment(SHELF_ALIGNMENT_BOTTOM);
+      shelf_->SetAlignment(wm::SHELF_ALIGNMENT_BOTTOM);
       break;
     case MENU_ALIGN_RIGHT:
       shell->metrics()->RecordUserMetricsAction(UMA_SHELF_ALIGNMENT_SET_RIGHT);
-      shelf_->SetAlignment(SHELF_ALIGNMENT_RIGHT);
+      shelf_->SetAlignment(wm::SHELF_ALIGNMENT_RIGHT);
       break;
   }
 }