Fix Profile* lifetime issues in Chrome's AppListViewDelegate

chrome/browser/ui/app_list/app_list_service_mac.mm

Index: chrome/browser/ui/app_list/app_list_service_mac.mm
diff --git a/chrome/browser/ui/app_list/app_list_service_mac.mm b/chrome/browser/ui/app_list/app_list_service_mac.mm
index 8e448e8cde0a1c4c728ce16299c30b7bcee3fd59..c7a97570932d39e3a43758b4aeccc43e041a87e8 100644
--- a/chrome/browser/ui/app_list/app_list_service_mac.mm
+++ b/chrome/browser/ui/app_list/app_list_service_mac.mm
@@ -452,6 +452,17 @@ void AppListServiceMac::CreateShortcut() {
       g_browser_process->profile_manager()->user_data_dir()));
 }
 
+void AppListServiceMac::DestroyAppList() {
+  // Due to reference counting, Mac can't guarantee that the widget is deleted,
+  // but mac supports a visible app list with a NULL profile, so there's also no
+  // need to tear it down completely.
+  DismissAppList();
+  [[window_controller_ appListViewController]
+      setDelegate:scoped_ptr<app_list::AppListViewDelegate>()];
+
+  profile_ = NULL;
+}
+
 NSWindow* AppListServiceMac::GetAppListWindow() {
   return [window_controller_ window];
 }