Remove old (dead) app list code.

ui/app_list/app_list_constants.h

Index: ui/app_list/app_list_constants.h
diff --git a/ui/app_list/app_list_constants.h b/ui/app_list/app_list_constants.h
index 99da8abc3632ecff3f8d5aff6200efeae008b15c..e23fa194a580c952d1ef210080fe30dc002c72ce 100644
--- a/ui/app_list/app_list_constants.h
+++ b/ui/app_list/app_list_constants.h
@@ -70,19 +70,13 @@ APP_LIST_EXPORT extern const int kTileIconSize;
 
 APP_LIST_EXPORT extern const SkColor kIconColor;
 
-APP_LIST_EXPORT extern const int kCenteredPreferredCols;
-APP_LIST_EXPORT extern const int kCenteredPreferredRows;
-
-APP_LIST_EXPORT extern const int kExperimentalPreferredCols;
-APP_LIST_EXPORT extern const int kExperimentalPreferredRows;
-
 APP_LIST_EXPORT extern const size_t kNumStartPageTiles;
 APP_LIST_EXPORT extern const size_t kMaxSearchResults;
 
 APP_LIST_EXPORT extern const int kReorderDroppingCircleRadius;
 
-APP_LIST_EXPORT extern const int kExperimentalAppsGridPadding;
-APP_LIST_EXPORT extern const int kExperimentalSearchBoxPadding;
+APP_LIST_EXPORT extern const int kAppsGridPadding;
+APP_LIST_EXPORT extern const int kSearchBoxPadding;
 
 APP_LIST_EXPORT extern size_t kMaxFolderItems;
 APP_LIST_EXPORT extern const size_t kNumFolderTopItems;