Fixed app launcher crashing trying to load guest profile.

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 f33787952a5cf644c7bc20e3b115a7bff42d029e..0e8dd2970ecbd20d1e45d9db261036550d49a7a5 100644
--- a/chrome/browser/ui/app_list/app_list_service_mac.mm
+++ b/chrome/browser/ui/app_list/app_list_service_mac.mm
@@ -346,6 +346,12 @@ void AppListServiceMac::Init(Profile* initial_profile) {
 void AppListServiceMac::InitWithProfilePath(
     Profile* initial_profile,
     const base::FilePath& profile_path) {
+  // App list profiles should not be off-the-record. It is currently possible to
+  // get here in an off-the-record profile via the Web Store
+  // (http://crbug.com/416380).
+  // TODO(mgiuca): DCHECK that requested_profile->IsOffTheRecord() and
+  // requested_profile->IsGuestSession() are false, once that is resolved.
+
   // On Mac, Init() is called multiple times for a process: any time there is no
   // browser window open and a new window is opened, and during process startup
   // to handle the silent launch case (e.g. for app shims). In the startup case,