Never create an app list for an incognito profile.

chrome/browser/ui/app_list/app_list_service_mac.mm

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #import "chrome/browser/ui/app_list/app_list_service_mac.h"
 
 #include <ApplicationServices/ApplicationServices.h>
 #import <Cocoa/Cocoa.h>
 
 #include "apps/app_shim/app_shim_mac.h"
@@ skipping 365 matching lines @@
   // launches will always have --silent-launch.
   if (CommandLine::ForCurrentProcess()->HasSwitch(switches::kShowAppList))
     ShowWindowNearDock();
 }
 
 Profile* AppListServiceMac::GetCurrentAppListProfile() {
   return profile_;
 }
 
 void AppListServiceMac::CreateForProfile(Profile* requested_profile) {
-  if (profile_ == requested_profile)
+  DCHECK(requested_profile);
+  if (profile_ && requested_profile->IsSameProfile(profile_))
     return;
 
-  profile_ = requested_profile;
+  profile_ = requested_profile->GetOriginalProfile();
 
   if (!window_controller_)
     window_controller_.reset([[AppListWindowController alloc] init]);
 
   scoped_ptr<app_list::AppListViewDelegate> delegate(
       new AppListViewDelegate(profile_, GetControllerDelegate()));
   [[window_controller_ appListViewController] setDelegate:delegate.Pass()];
 }
 
 void AppListServiceMac::ShowForProfile(Profile* requested_profile) {
   if (requested_profile->IsManaged())
     return;
 
   InvalidatePendingProfileLoads();
 
-  if (requested_profile == profile_) {
+  if (profile_ && requested_profile->IsSameProfile(profile_)) {
     ShowWindowNearDock();
     return;
   }
 
   SetProfilePath(requested_profile->GetPath());
   CreateForProfile(requested_profile);
   ShowWindowNearDock();
 }
 
 void AppListServiceMac::DismissAppList() {
@@ skipping 179 matching lines @@
 
 - (void)animationDidEnd:(NSAnimation*)animation {
   content::BrowserThread::PostTask(
       content::BrowserThread::UI,
       FROM_HERE,
       base::Bind(&AppListServiceMac::WindowAnimationDidEnd,
                  base::Unretained(AppListServiceMac::GetInstance())));
 }
 
 @end