add new tab page for DuckDuckGo search engine

This change adds a new_tab_url for the DuckDuckGo search engine.

Change-Id: I37be02e07eb7e4aa90f115455ce7a21832ff4eab
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1555048Reviewed-by: Vasilii Sukhanov <vasilii@chromium.org>
Commit-Queue: Vasilii Sukhanov <vasilii@chromium.org>
Cr-Commit-Position: refs/heads/master@{#648687}

AUTHORS

@@ -1020,6 +1020,7 @@ Code Aurora Forum <*@codeaurora.org>
 Collabora Limited <*@collabora.com>
 Comodo CA Limited
 Cosium <*@cosium.com>
+Duck Duck Go, Inc. <*@duckduckgo.com>
 Endless Mobile, Inc. <*@endlessm.com>
 Estimote, Inc. <*@estimote.com>
 Facebook, Inc. <*@fb.com>

components/search_engines/prepopulated_engines.json

@@ -28,7 +28,7 @@
     // Increment this if you change the data in ways that mean users with
     // existing data should get a new version. Otherwise, existing data may
     // continue to be used and updates made here will not always appear.
-    "kCurrentDataVersion": 111
+    "kCurrentDataVersion": 112
   },
 
   // The following engines are included in country lists and are added to the
@@ -101,6 +101,7 @@
       "favicon_url": "https://duckduckgo.com/favicon.ico",
       "search_url": "https://duckduckgo.com/?q={searchTerms}",
       "suggest_url": "https://duckduckgo.com/ac/?q={searchTerms}&type=list",
+      "new_tab_url": "https://duckduckgo.com/chrome_newtab",
       "type": "SEARCH_ENGINE_DUCKDUCKGO",
       "id": 92
     },