Don't create MostVisitedSites in incognito

chrome/browser/ntp_tiles/chrome_most_visited_sites_factory.cc

 // 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.
 
 #include "chrome/browser/ntp_tiles/chrome_most_visited_sites_factory.h"
 
 #include <utility>
 #include <vector>
 
 #include "base/bind.h"
@@ skipping 90 matching lines @@
   if (supervisor_observer_) {
     supervisor_observer_->OnBlockedSitesChanged();
   }
 }
 
 }  // namespace
 
 // static
 std::unique_ptr<ntp_tiles::MostVisitedSites>
 ChromeMostVisitedSitesFactory::NewForProfile(Profile* profile) {
+  // MostVisitedSites doesn't exist in incognito profiles.
+  if (profile->IsOffTheRecord()) {
+    return nullptr;
+  }
+
   return base::MakeUnique<ntp_tiles::MostVisitedSites>(
       profile->GetPrefs(), TopSitesFactory::GetForProfile(profile),
       SuggestionsServiceFactory::GetForProfile(profile),
 #if defined(OS_ANDROID)
       ChromePopularSitesFactory::NewForProfile(profile),
 #else
       nullptr,
 #endif
       base::MakeUnique<ntp_tiles::IconCacherImpl>(
           FaviconServiceFactory::GetForProfile(
               profile, ServiceAccessType::IMPLICIT_ACCESS),
           base::MakeUnique<image_fetcher::ImageFetcherImpl>(
               base::MakeUnique<suggestions::ImageDecoderImpl>(),
               profile->GetRequestContext())),
       base::MakeUnique<SupervisorBridge>(profile));
 }