Properly detect if Chrome is incognito

ios/chrome/browser/ui/webui/ntp_tiles_internals_ui.cc

 // Copyright 2016 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 "ios/chrome/browser/ui/webui/ntp_tiles_internals_ui.h"
 
 #include "base/memory/ptr_util.h"
 #include "components/grit/components_resources.h"
 #include "components/ntp_tiles/field_trial.h"
 #include "components/ntp_tiles/most_visited_sites.h"
@@ skipping 39 matching lines @@
 
   DISALLOW_COPY_AND_ASSIGN(IOSNTPTilesInternalsMessageHandlerBridge);
 };
 
 void IOSNTPTilesInternalsMessageHandlerBridge::RegisterMessages() {
   handler_.RegisterMessages(this);
 }
 
 bool IOSNTPTilesInternalsMessageHandlerBridge::SupportsNTPTiles() {
   auto* state = ios::ChromeBrowserState::FromWebUIIOS(web_ui());
-  return !state->HasOffTheRecordChromeBrowserState();
+  return state == state->GetOriginalChromeBrowserState();

[sdefresne, 2017/01/19 12:14:07]

Why not just use IsOffTheRecord() instead?

  auto* state = ios::ChromeBrowserState::FromWebUIIOS(web_ui());
  return state->IsOffTheRecord();

 }
 
 bool IOSNTPTilesInternalsMessageHandlerBridge::DoesSourceExist(
     ntp_tiles::NTPTileSource source) {
   switch (source) {
     case ntp_tiles::NTPTileSource::TOP_SITES:
     case ntp_tiles::NTPTileSource::SUGGESTIONS_SERVICE:
     case ntp_tiles::NTPTileSource::POPULAR:
       return true;
     case ntp_tiles::NTPTileSource::WHITELIST:
@@ skipping 46 matching lines @@
 
 NTPTilesInternalsUI::NTPTilesInternalsUI(web::WebUIIOS* web_ui)
     : web::WebUIIOSController(web_ui) {
   web::WebUIIOSDataSource::Add(ios::ChromeBrowserState::FromWebUIIOS(web_ui),
                                CreateNTPTilesInternalsHTMLSource());
   web_ui->AddMessageHandler(
       base::MakeUnique<IOSNTPTilesInternalsMessageHandlerBridge>());
 }
 
 NTPTilesInternalsUI::~NTPTilesInternalsUI() {}