[Sync] Implement MemoryDumpProvider.

components/sync/protocol/proto_value_conversions.cc

Index: components/sync/protocol/proto_value_conversions.cc
diff --git a/components/sync/protocol/proto_value_conversions.cc b/components/sync/protocol/proto_value_conversions.cc
index 1f6bf95b148b1c61af1845a514069270b84f198d..4308b40016bb4f08f54ee8629c3e2b4644735c15 100644
--- a/components/sync/protocol/proto_value_conversions.cc
+++ b/components/sync/protocol/proto_value_conversions.cc
@@ -168,6 +168,22 @@ class ToValueVisitor {
     }
   }
 
+  // EnhancedBookmarksFlags
+  template <class P>
+  void Visit(const P& parent_proto,
+             const char* field_name,
+             const sync_pb::EnhancedBookmarksFlags& field) {
+    // Obsolete, don't visit
+  }
+
+  // WalletSyncFlags
+  template <class P>
+  void Visit(const P& parent_proto,
+             const char* field_name,
+             const sync_pb::WalletSyncFlags& field) {
+    // Obsolete, don't visit
+  }
+
   // PasswordSpecificsData
   std::unique_ptr<base::DictionaryValue> ToValue(
       const sync_pb::PasswordSpecificsData& proto) const {