Refactors DockedWindowLayoutManager in terms of ash/wm/common

ash/shelf/app_list_button.cc

Index: ash/shelf/app_list_button.cc
diff --git a/ash/shelf/app_list_button.cc b/ash/shelf/app_list_button.cc
index d1ee54b7854ba05358783d47f9bbf4ef8b0f52b6..a57e12378802c6ebd7720ab4f09aae6c80058aa8 100644
--- a/ash/shelf/app_list_button.cc
+++ b/ash/shelf/app_list_button.cc
@@ -123,14 +123,14 @@ void AppListButton::OnPaint(gfx::Canvas* canvas) {
   gfx::Rect contents_bounds = GetContentsBounds();
   gfx::Rect background_bounds, forground_bounds;
 
-  ShelfAlignment alignment = shelf_view_->shelf()->alignment();
+  wm::ShelfAlignment alignment = shelf_view_->shelf()->alignment();
   background_bounds.set_size(background_image->size());
-  if (alignment == SHELF_ALIGNMENT_LEFT) {
+  if (alignment == wm::SHELF_ALIGNMENT_LEFT) {
     background_bounds.set_x(contents_bounds.width() -
         ShelfLayoutManager::kShelfItemInset - background_image->width());
     background_bounds.set_y(contents_bounds.y() +
         (contents_bounds.height() - background_image->height()) / 2);
-  } else if(alignment == SHELF_ALIGNMENT_RIGHT) {
+  } else if (alignment == wm::SHELF_ALIGNMENT_RIGHT) {
     background_bounds.set_x(ShelfLayoutManager::kShelfItemInset);
     background_bounds.set_y(contents_bounds.y() +
         (contents_bounds.height() - background_image->height()) / 2);