Remove WebToolbarDelegate from GoogleLandingDataSource.

ios/chrome/browser/ui/ntp/google_landing_consumer.h

 // Copyright 2017 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.
 
 #ifndef IOS_CHROME_BROWSER_UI_NTP_GOOGLE_LANDING_CONSUMER_H_
 #define IOS_CHROME_BROWSER_UI_NTP_GOOGLE_LANDING_CONSUMER_H_
 
 #import <Foundation/Foundation.h>
 
 // TODO(crbug.com/694750): Remove these two when the types below are changed.
@@ skipping 26 matching lines @@
 // Sets the icon of a what's new promo.
 // TODO(crbug.com/694750): This should not be WhatsNewIcon.
 - (void)setPromoIcon:(WhatsNewIcon)promoIcon;
 
 // |YES| if a what's new promo can be displayed.
 - (void)setPromoCanShow:(BOOL)promoCanShow;
 
 // The number of tabs to show in the google landing fake toolbar.
 - (void)setTabCount:(int)tabCount;
 
+// |YES| if the google landing toolbar can show the forward arrow.
+- (void)setCanGoForward:(BOOL)canGoForward;
+
+// |YES| if the google landing toolbar can show the back arrow.
+- (void)setCanGoBack:(BOOL)canGoBack;
+
 // TODO(crbug.com/694750): This should be replaced with consumer suitable data
 // type property.
 // Tells the consumer to that most visited data updated.
 - (void)mostVisitedDataUpdated;
 
 // Tells the consumer a most visited icon was updated.
 - (void)mostVisitedIconMadeAvailableAtIndex:(NSUInteger)index;
 
 // TODO(crbug.com/694750): These two calls can be made with dispatcher instead.
 // The location bar has lost focus.
 - (void)locationBarResignsFirstResponder;
 
 // Tell location bar has taken focus.
 - (void)locationBarBecomesFirstResponder;
 
 // TODO(crbug.com/694750): This call will be removed once dispatching is
 // available.
 // Asks the consumer to execute a chrome command.
 - (void)chromeExecuteCommand:(id)sender;
 
 @end
 
 #endif  // IOS_CHROME_BROWSER_UI_NTP_GOOGLE_LANDING_CONSUMER_H_