Change behaivor to decide whether a search engine should be shown in the default list

components/sync/protocol/search_engine_specifics.proto

Index: components/sync/protocol/search_engine_specifics.proto
diff --git a/components/sync/protocol/search_engine_specifics.proto b/components/sync/protocol/search_engine_specifics.proto
index e9f3cd9322795374a6a11e6b4d1e8cda94c47145..e58a04fbfc292f3772954faf793c41b6a1757929 100644
--- a/components/sync/protocol/search_engine_specifics.proto
+++ b/components/sync/protocol/search_engine_specifics.proto
@@ -33,8 +33,7 @@ message SearchEngineSpecifics {
   optional int64 date_created = 7;
   // A list of supported input encodings.
   optional string input_encodings = 8;
-  // Whether this entry is shown in the list of default search engines or not.
-  optional bool show_in_default_list = 9;
+  // ID 9 reserved - previously used by show_in_default_list, now deprecated.

[Peter Kasting, 2016/11/10 06:41:07]

Get careful review from the sync folks as to exactly how they want to mark
deprecated fields and ensure that data from newer versions of Chrome syncs
properly with older versions.

[ltian, 2016/11/11 03:52:13]

Sure, I will double check with sync folks to make sure this is the right way.

   // The parameterized URL that provides suggestions as the user types.
   optional string suggestions_url = 10;
   // The ID associated with the prepopulate data this search engine comes from.