Make possible to remove the last most visited tile

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

Index: ios/chrome/browser/ui/ntp/google_landing_mediator.mm
diff --git a/ios/chrome/browser/ui/ntp/google_landing_mediator.mm b/ios/chrome/browser/ui/ntp/google_landing_mediator.mm
index 47ae5c43e87f33a41bef14c82233d5e9dc833fc3..46028db36b0af43160b887b8a39893e8b3003911 100644
--- a/ios/chrome/browser/ui/ntp/google_landing_mediator.mm
+++ b/ios/chrome/browser/ui/ntp/google_landing_mediator.mm
@@ -383,11 +383,7 @@ void SearchEngineObserver::OnTemplateURLServiceChanged() {
 #pragma mark - Private
 
 - (void)useFreshData {

[justincohen, 2017/06/06 15:47:34]

Did we also want a DCHECK to confirm that |freshMostVisitedData| is updated
after updating the blacklist?

[gambard, 2017/06/06 16:19:23]

It seems complicated for a little gain in my opinion. Do you think it is very
important?

-  if (self.freshMostVisitedData.size() == 0) {
-    return;
-  }
   _mostVisitedData = self.freshMostVisitedData;
-  self.freshMostVisitedData.clear();
   [self.consumer mostVisitedDataUpdated];
 }