Fix flaky CertificateReportingService browser tests.

chrome/browser/safe_browsing/certificate_reporting_service.h

Index: chrome/browser/safe_browsing/certificate_reporting_service.h
diff --git a/chrome/browser/safe_browsing/certificate_reporting_service.h b/chrome/browser/safe_browsing/certificate_reporting_service.h
index 7137655e1e40e4bbc5117853a4af095773fb7076..79f7bf62ca7a206f50f576525cfe06577ae7cbf2 100644
--- a/chrome/browser/safe_browsing/certificate_reporting_service.h
+++ b/chrome/browser/safe_browsing/certificate_reporting_service.h
@@ -152,7 +152,8 @@ class CertificateReportingService : public KeyedService {
       uint32_t server_public_key_version,
       size_t max_queued_report_count,
       base::TimeDelta max_report_age,
-      base::Clock* clock);
+      base::Clock* clock,
+      const base::Callback<void()>& reset_callback);
 
   ~CertificateReportingService() override;
 
@@ -226,6 +227,9 @@ class CertificateReportingService : public KeyedService {
 
   base::Clock* const clock_;
 
+  // Called when the service is reset.
+  base::Callback<void()> reset_callback_;
+
   // Encryption parameters.
   uint8_t* server_public_key_;
   uint32_t server_public_key_version_;