Revert of Browser tests for using the new SafeBrowsing protocol (v4)

components/safe_browsing_db/v4_get_hash_protocol_manager.h

Index: components/safe_browsing_db/v4_get_hash_protocol_manager.h
diff --git a/components/safe_browsing_db/v4_get_hash_protocol_manager.h b/components/safe_browsing_db/v4_get_hash_protocol_manager.h
index 8a0f855da504051de934ce083b12ba1246e2802e..ffd4ea89056579c54b30114ea98269a010231af1 100644
--- a/components/safe_browsing_db/v4_get_hash_protocol_manager.h
+++ b/components/safe_browsing_db/v4_get_hash_protocol_manager.h
@@ -288,10 +288,6 @@
                    const std::vector<FullHashInfo>& full_hash_infos,
                    const base::Time& negative_cache_expire);
 
- protected:
-  // A cache of full hash results.
-  FullHashCache full_hash_cache_;
-
  private:
   // Map of GetHash requests to parameters which created it.
   using PendingHashRequests =
@@ -332,6 +328,9 @@
 
   // The clock used to vend times.
   std::unique_ptr<base::Clock> clock_;
+
+  // A cache of full hash results.
+  FullHashCache full_hash_cache_;
 
   // The following sets represent the combination of lists that we would always
   // request from the server, irrespective of which list we found the hash