[Android] Allow setting recently visited search engines as default search engine

chrome/android/java/strings/android_chrome_strings.grd

Index: chrome/android/java/strings/android_chrome_strings.grd
diff --git a/chrome/android/java/strings/android_chrome_strings.grd b/chrome/android/java/strings/android_chrome_strings.grd
index c602646fa9482813c12738680832eb603c4561f3..35c11ab753c599dfca08b90ba1ecaf3b3d50f78b 100644
--- a/chrome/android/java/strings/android_chrome_strings.grd
+++ b/chrome/android/java/strings/android_chrome_strings.grd
@@ -257,6 +257,9 @@ CHAR-LIMIT guidelines:
       <message name="IDS_SEARCH_ENGINE_LOCATION_BLOCKED" desc="The text of a link displayed when location permission for a particular search engine is blocked.">
         Location is blocked
       </message>
+      <message name="IDS_SEARCH_ENGINE_RECENTLY_VISITED" desc="Divider between prepopulated and recently visited search engines.">

[gone, 2016/11/28 21:37:02]

Maybe desc -> "Header for the list of recently visited search engines"?  Divider
doesn't say much.

[ltian, 2016/11/29 02:44:02]

Done.

+        Recently visited
+      </message>
 
       <!-- Autofill preferences -->
       <message name="IDS_PREFS_AUTOFILL" desc="Title for 'Autofill forms' settings, which control what personal data can be automatically filled into web page forms. [CHAR-LIMIT=32]">