[ios] Restore refresh ntp toolbars.

Followup to https://chromium-review.googlesource.com/c/chromium/src/+/941441, as
hiding blur will hide the entire toolbar.

Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: I2b051fc0573e45922d35bb695bfd3cdff289b3e8
Reviewed-on: https://chromium-review.googlesource.com/951748Reviewed-by: Gauthier Ambard <gambard@chromium.org>
Commit-Queue: Justin Cohen <justincohen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#541463}

ios/chrome/browser/ui/toolbar/adaptive/primary_toolbar_view_controller.mm

@@ -61,14 +61,12 @@
 
   self.view.backgroundColor =
       self.buttonFactory.toolbarConfiguration.NTPBackgroundColor;
-  self.view.blur.hidden = YES;
   self.view.locationBarContainer.hidden = YES;
 }
 
 - (void)resetAfterSideSwipeSnapshot {
   [super resetAfterSideSwipeSnapshot];
   self.view.backgroundColor = nil;
-  self.view.blur.hidden = NO;
   self.view.locationBarContainer.hidden = NO;
 }