Replace TabModel with WebStateList in GoogleLandingController.

ios/chrome/browser/ui/ntp/google_landing_controller.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 "ios/chrome/browser/ui/ntp/google_landing_controller.h"
 
 #include <algorithm>
 
 #include "base/mac/foundation_util.h"
 #include "base/metrics/user_metrics.h"
@@ skipping 213 matching lines @@
 
 @implementation GoogleLandingController
 
 @dynamic view;
 @synthesize logoVendor = _logoVendor;
 @synthesize dataSource = _dataSource;
 // Property declared in NewTabPagePanelProtocol.
 @synthesize delegate = _delegate;
 @synthesize showLogo = _showLogo;
 @synthesize offTheRecord = _offTheRecord;
+@synthesize tabCount = _tabCount;
 @synthesize voiceSearchEnabled = _voiceSearchEnabled;
 
 - (void)loadView {
   self.view = [[[GoogleLandingView alloc]
       initWithFrame:[UIScreen mainScreen].bounds] autorelease];
 }
 
 - (void)viewDidLoad {
   [super viewDidLoad];
   [self.view setAutoresizingMask:UIViewAutoresizingFlexibleHeight |
@@ skipping 716 matching lines @@
                              withReuseIdentifier:@"header"
                                     forIndexPath:indexPath] retain]);
       [_headerView addSubview:[self.logoVendor view]];
       [_headerView addSubview:_searchTapTarget];
       [_headerView addViewsToSearchField:_searchTapTarget];
 
       if (!IsIPadIdiom()) {
         // iPhone header also contains a toolbar since the normal toolbar is
         // hidden.
         [_headerView addToolbarWithDataSource:self.dataSource];
+        [_headerView setToolbarTabCount:self.tabCount];
       }
       [_supplementaryViews addObject:_headerView];
     }
     return _headerView;
   }
 
   if (indexPath.section == SectionWithMostVisited) {
     if (!_promoHeaderView) {
       _promoHeaderView.reset([[collectionView
           dequeueReusableSupplementaryViewOfKind:
@@ skipping 469 matching lines @@
 
 - (void)mostVisitedIconMadeAvailableAtIndex:(NSUInteger)index {
   if (index > [self numberOfItems])
     return;
 
   NSIndexPath* indexPath =
       [NSIndexPath indexPathForRow:index inSection:SectionWithMostVisited];
   [_mostVisitedView reloadItemsAtIndexPaths:@[ indexPath ]];
 }
 
+- (void)setTabCount:(int)tabCount {
+  _tabCount = tabCount;

[rohitrao (ping after 24h), 2017/04/19 19:26:33]

Why do we need to cache this in an ivar?  Does headerView only sometimes exist? 
Is tabCount sometimes called before the view is loaded?

[justincohen, 2017/04/19 21:12:23]

headerView is created later.

+  [_headerView setToolbarTabCount:self.tabCount];
+}
+
 @end