Fix voice over for doodle

The accessibility is now done downstream.

Bug: 798075
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: I71243ea8769212737d1b6d4650254b4363e364ab
Reviewed-on: https://chromium-review.googlesource.com/846987Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Commit-Queue: Gauthier Ambard <gambard@chromium.org>
Cr-Commit-Position: refs/heads/master@{#526490}

ios/chrome/browser/ui/content_suggestions/content_suggestions_header_view_controller.mm

@@ -180,10 +180,6 @@ const CGFloat kHintLabelSidePadding = 12;
     self.headerView = [[NewTabPageHeaderView alloc] init];
     [self addFakeOmnibox];
 
-    self.logoVendor.view.isAccessibilityElement = YES;
-    self.logoVendor.view.accessibilityLabel =
-        l10n_util::GetNSString(IDS_IOS_NEW_TAB_LOGO_ACCESSIBILITY_LABEL);
-
     [self.headerView addSubview:self.logoVendor.view];
     [self.headerView addSubview:self.fakeOmnibox];
     self.logoVendor.view.translatesAutoresizingMaskIntoConstraints = NO;