Move ContentSuggestions identifiers to custom target

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

 // 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.
 
 #import "ios/chrome/browser/ui/content_suggestions/content_suggestions_article_item.h"
 
 #include "base/time/time.h"
 #import "ios/chrome/browser/ui/colors/MDCPalette+CrAdditions.h"
 #import "ios/chrome/browser/ui/uikit_ui_util.h"
 #import "ios/chrome/browser/ui/util/i18n_string.h"
 #import "ios/third_party/material_components_ios/src/components/Typography/src/MaterialTypography.h"
+#include "url/gurl.h"
 
 #if !defined(__has_feature) || !__has_feature(objc_arc)
 #error "This file requires ARC support."
 #endif
 
 namespace {
 const CGFloat kImageSize = 72;
 // When updating this, make sure to update |layoutSubviews|.
 const CGFloat kStandardSpacing = 8;
 }
@@ skipping 184 matching lines @@
       @{
         @"image" : _imageView,
         @"title" : _titleLabel,
         @"text" : _subtitleLabel,
         @"publish" : _publisherLabel,
       },
       @{ @"space" : @(kStandardSpacing) });
 }
 
 @end