Updating UMA labels for SearchEngineType enum.

Change-Id: I44c09d48866dd89328217dd3279ef23ca6fc5214
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1598470
Auto-Submit: Filip Gorski <fgorski@chromium.org>
Reviewed-by: Brandon Wylie <wylieb@chromium.org>
Commit-Queue: Brandon Wylie <wylieb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#657327}

tools/metrics/histograms/enums.xml

@@ -42501,6 +42501,10 @@ Called by update_net_trust_anchors.py.-->
   <int value="46" label="Yandex"/>
   <int value="47" label="Zoznam"/>
   <int value="48" label="360"/>
+  <int value="49" label="CocCoc"/>
+  <int value="50" label="DuckDuckGo"/>
+  <int value="51" label="Parsijoo"/>
+  <int value="52" label="Qwant"/>
 </enum>
 
 <enum name="OmniboxSuggestRequests">