Convert TrackedPreferenceValidationDelegate into a mojo interface.

chrome/browser/safe_browsing/incident_reporting/incident_reporting_service.h

Index: chrome/browser/safe_browsing/incident_reporting/incident_reporting_service.h
diff --git a/chrome/browser/safe_browsing/incident_reporting/incident_reporting_service.h b/chrome/browser/safe_browsing/incident_reporting/incident_reporting_service.h
index f4b0ccff3b0283dc082c71364165c4ceeb843a61..d23197b4c390ed836ea40a3a529d7214f4871424 100644
--- a/chrome/browser/safe_browsing/incident_reporting/incident_reporting_service.h
+++ b/chrome/browser/safe_browsing/incident_reporting/incident_reporting_service.h
@@ -28,7 +28,6 @@
 #include "content/public/browser/notification_registrar.h"
 
 class Profile;
-class TrackedPreferenceValidationDelegate;
 
 namespace base {
 class TaskRunner;
@@ -44,6 +43,12 @@ namespace net {
 class URLRequestContextGetter;
 }
 
+namespace prefs {
+namespace mojom {
+class TrackedPreferenceValidationDelegate;
+}
+}
+
 namespace safe_browsing {
 
 #if !defined(GOOGLE_CHROME_BUILD)
@@ -94,7 +99,7 @@ class IncidentReportingService : public content::NotificationObserver {
   // for validation failures in |profile|. The delegate may outlive the service,
   // but incidents reported by it will no longer have any effect after the
   // service is deleted.
-  std::unique_ptr<TrackedPreferenceValidationDelegate>
+  std::unique_ptr<prefs::mojom::TrackedPreferenceValidationDelegate>
   CreatePreferenceValidationDelegate(Profile* profile);
 
   // Registers |callback| to be run after some delay following process launch.