Fix Thread::SetMessageLoop(nullptr).

chrome/browser/safe_browsing/protocol_manager.h

Index: chrome/browser/safe_browsing/protocol_manager.h
diff --git a/chrome/browser/safe_browsing/protocol_manager.h b/chrome/browser/safe_browsing/protocol_manager.h
index 98bc17d6e577e4047e34f68cd60d7f14bc1642bc..fbe9c163f0d38b17f74afcf6ff675b62bb6f9e11 100644
--- a/chrome/browser/safe_browsing/protocol_manager.h
+++ b/chrome/browser/safe_browsing/protocol_manager.h
@@ -174,6 +174,8 @@ class SafeBrowsingProtocolManager : public net::URLFetcherDelegate {
   // Returns whether another update is currently scheduled.
   bool IsUpdateScheduled() const;
 
+  static base::TimeDelta GetUpdateTimeoutForTesting();
+
  protected:
   // Constructs a SafeBrowsingProtocolManager for |delegate| that issues
   // network requests using |request_context_getter|.
@@ -280,7 +282,6 @@ class SafeBrowsingProtocolManager : public net::URLFetcherDelegate {
   // Called after the chunks are added to the database.
   void OnAddChunksComplete();
 
- private:
   // Map of GetHash requests to parameters which created it.
   struct FullHashDetails {
     FullHashDetails();