Ignore: v4_update_protocol_manager: Basic implementation with TODOs

components/safe_browsing_db/database_manager.cc

Index: components/safe_browsing_db/database_manager.cc
diff --git a/components/safe_browsing_db/database_manager.cc b/components/safe_browsing_db/database_manager.cc
index f68ffa572beea24ec0c90046af39f4c00fbeeaad..ba9ea16812d7d4c44552c5161d6241450201349c 100644
--- a/components/safe_browsing_db/database_manager.cc
+++ b/components/safe_browsing_db/database_manager.cc
@@ -14,12 +14,17 @@ using content::BrowserThread;
 namespace safe_browsing {
 
 SafeBrowsingDatabaseManager::SafeBrowsingDatabaseManager()
-    : SafeBrowsingDatabaseManager(NULL, V4ProtocolConfig()) {
+    : v4_get_hash_protocol_manager_(NULL) {
+}
+
+SafeBrowsingDatabaseManager::~SafeBrowsingDatabaseManager() {
+  DCHECK(v4_get_hash_protocol_manager_ == NULL);
 }
 
 void SafeBrowsingDatabaseManager::StartOnIOThread(
     net::URLRequestContextGetter* request_context_getter,
     const V4ProtocolConfig& config) {
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
   // Instantiate a V4GetHashProtocolManager.
   if (request_context_getter) {
     v4_get_hash_protocol_manager_ = V4GetHashProtocolManager::Create(