Add deprecation warning banner to App Launcher on Windows and Linux.

ui/app_list/app_list_constants.cc

Index: ui/app_list/app_list_constants.cc
diff --git a/ui/app_list/app_list_constants.cc b/ui/app_list/app_list_constants.cc
index 84706bd88634e27e750b50a938b60a5bf62bd06f..b9590a3d0e757333200bca47acd9a61f6b71e24c 100644
--- a/ui/app_list/app_list_constants.cc
+++ b/ui/app_list/app_list_constants.cc
@@ -83,7 +83,11 @@ const gfx::Tween::Type kFolderFadeOutTweenType = gfx::Tween::FAST_OUT_LINEAR_IN;
 
 // Preferred number of columns and rows in apps grid.
 const int kPreferredCols = 4;
+#if defined(OS_CHROMEOS)
 const int kPreferredRows = 4;
+#else
+const int kPreferredRows = 3;
+#endif  // defined(OS_CHROMEOS)
 const int kGridIconDimension = 48;
 
 // Preferred search result icon sizes.