Replace TabModel with WebStateList in GoogleLandingController.

ios/chrome/browser/ui/ntp/google_landing_controller.mm

Index: ios/chrome/browser/ui/ntp/google_landing_controller.mm
diff --git a/ios/chrome/browser/ui/ntp/google_landing_controller.mm b/ios/chrome/browser/ui/ntp/google_landing_controller.mm
index 19463eca637ab97ddf7a0d8164c26114892e123b..d4859011d11bea048b9295457462a537030e9238 100644
--- a/ios/chrome/browser/ui/ntp/google_landing_controller.mm
+++ b/ios/chrome/browser/ui/ntp/google_landing_controller.mm
@@ -231,6 +231,7 @@ const CGFloat kMostVisitedPaddingIPadFavicon = 24;
 @synthesize delegate = _delegate;
 @synthesize showLogo = _showLogo;
 @synthesize offTheRecord = _offTheRecord;
+@synthesize tabCount = _tabCount;
 @synthesize voiceSearchEnabled = _voiceSearchEnabled;
 
 - (void)loadView {
@@ -967,6 +968,7 @@ const CGFloat kMostVisitedPaddingIPadFavicon = 24;
         // iPhone header also contains a toolbar since the normal toolbar is
         // hidden.
         [_headerView addToolbarWithDataSource:self.dataSource];
+        [_headerView setToolbarTabCount:self.tabCount];
       }
       [_supplementaryViews addObject:_headerView];
     }
@@ -1456,4 +1458,9 @@ const CGFloat kMostVisitedPaddingIPadFavicon = 24;
   [_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