[NTP] Update text shown when a custom link is removed.

Bug: 851318
Change-Id: I314fea352b79d012f9b8d8453ceb8a46783dc66e
Reviewed-on: https://chromium-review.googlesource.com/1121322Reviewed-by: Mathieu Perreault <mathp@chromium.org>
Reviewed-by: Marc Treib <treib@chromium.org>
Commit-Queue: Ramya Nagarajan <ramyan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#572598}

chrome/browser/search/local_ntp_source.cc

@@ -134,7 +134,9 @@ std::unique_ptr<base::DictionaryValue> GetTranslatedStrings(bool is_google) {
   auto translated_strings = std::make_unique<base::DictionaryValue>();
 
   AddString(translated_strings.get(), "thumbnailRemovedNotification",
-            IDS_NEW_TAB_THUMBNAIL_REMOVED_NOTIFICATION);
+            features::IsMDIconsEnabled()
+                ? IDS_NTP_CONFIRM_MSG_SHORTCUT_REMOVED
+                : IDS_NEW_TAB_THUMBNAIL_REMOVED_NOTIFICATION);
   AddString(translated_strings.get(), "removeThumbnailTooltip",
             IDS_NEW_TAB_REMOVE_THUMBNAIL_TOOLTIP);
   AddString(translated_strings.get(), "undoThumbnailRemove",